Diopters and Photogrammetry

LATE ENTRY!

I forgot to include the AfterStack19 invitation in my original posting of this blog - please join us on Saturday at 10AM for one of the most helpful and informative post-production round tables you are likely to find! Here is the invitation (and it is FREE)…

Allan Walls is inviting you to a scheduled Zoom meeting.

Topic: Afterstack19

Time: Mar 22, 2025 10:00 AM Central Time (US and Canada)

Join Zoom Meeting

https://us02web.zoom.us/j/6916802815?pwd=TS9tZi9ZL1NXeVUvOUF4eTg5YjdlZz09&omn=81124304990

Meeting ID: 691 680 2815

Passcode: 678122

And here is your link to the Google Drive folder where you may deposit any images you would like to share with the group - https://drive.google.com/drive/folders/1XA7tv9O2SW0TGRjiIIRBzMRMAu-ZAkKe?usp=share_link

And now, back to the post -

Greetings All,

incoming!

I am so glad Monday is here and I can take a breather after a marathon weekend of getting caught up on all the projects that have been piling up since the beginning of the year. This is my desk this morning…

If you are waiting on me to send you something, there is a good chance it will be on its way to you before the end of the day. If you are with the IRS and are waiting for me to pay my tax bill for last year, please be patient.

Before telling you about this week’s activities, I need to remind you that I will be out of the studio next week and so there will be no Macro Talk Too on Thursday 3/27 and no Pzoom on Saturday 3//29/25. I hope to be back streaming on April Fools Day, when I will give you a rundown of what I learned at the Florida Convention of Camera Clubs during my visit.

This week I will be kicking things off with a discussion, mostly for newcomers, on the subject of close-up filters in macro photography. I will be giving an overview of close-up filters and how they can be used in macro photography, along with useful information on the best filters available today. To join the conversation, follow this link at 8PM on Tuesday - https://youtube.com/live/3vj2mCfX4pY?feature=share

On Thursday’s Macro Talk Too I will be talking about my experience with photogrammetry in macro photography. I was asked to do this a little while ago, so here it is! The link to join the discussion is right here -  https://youtube.com/live/pPmy3Uh3kDE?feature=share

On Saturday I will be hosting AfterStack 19 and in this episode it will be all about your pictures. You are invited to drop any images that you are having g trouble with into our shared Google drive folder and we will do our best to help you figure out how to get the best of each of them. Be sure to put them in the sub-folder for 3/22/25 so that Bud and I can get them in time for Saturday.

Does anyone actually own one of these mythical lenses? Photo Courtesy of Robert O’Toole

I will leave it at that today as I have a ton of preparation for the week ahead! See you soon!

The Great Thaw

That is what it feels like, after two sun-filled days with temperatures in the 40’s and low 50’s - what the Middle-Earthers refer to as “warm”. It is not warm, of course, but one could be forgiven for thinking it is after two weeks of soul-destroying single digit highs and digit-destroying sub-zero lows. And some of the ice and snow did melt this afternoon, though not for long - most of the water in Middle Earth has phase-shifted back to the solid form. While not many who know me would accuse me of being prone to optimism, I have come across a silver lining to this meteorological catastrophe called winter. My fear of freezing to death out in the elements has forced me to face up to my fear of freezing to death in this basement, and this has allowed me to attack a few projects that have been somewhat neglected since the beginning of winter, seven years ago. Throwing myself into these projects has renewed my enthusiasm for making stuff, and you know what happens when I get enthusiastic about stuff- I feel duty-bound to get you enthusiastic about stuff too. That is my goal for this, the last week of February, 2025.

Kicking things off on Tuesday I aim going to come at the subject of DIY obliquely, walking you through the steps required to modify your macro platform for use at high magnification and high resolution. At the heart of these modifications is a gadget that, to the best of my knowledge, cannot be purchased but must be constructed. I plan to show you exactly how this is done, from start to finish, in under an hour. The link to this episode of Macro Talk, which starts at 8PM on

On Thursday, in Macro Talk Too, I will come at DIY in macro photography more directly, breaking down the various skills and tools that I believe are worth acquiring, in order to get the most out of our macro photography. I will do this by giving multiple examples of how my growing experience with tools and techniques have paid off in my macro experience over the years. I think it should be a lot of fun and if you would like to join the conversation, here is a link to the livestream on Thursday - https://youtube.com/live/JV1z2k_IatM?feature=share

This is the last week of the February Macro Competition - your pictures must be in before midnight on Friday. The theme for this month is Symmetry and I can’t wait to see what you have come up with! I will announce the theme for March later this week. Saturday is going to be a busy day for me as I will be judging the competition on Saturday while also hosting our first Pzoom meeting of the month. I am trying to come up with a creative way to combine these two activities and I think I may have a workable solution - should be fun!

For anyone who is interested, I placed a bid on a microscope this morning. It is a gorgeous Olympus CX53 fluorescence scope with DIC. It comes with a full complement of high NA objectives, DIC prisms and a multifunction condenser. I has literally everything I want in microscope - but I lost the auction in the last 5 minutes. I’m not really surprised - my bid was ridiculously low for the almost new $20K microscope, so it didn’t take too much to beat it and someone was watching closely. The final price was only $1,700, but that is out of my comfort zone until the IRS has my pound of flesh. You win some, you lose some!

Sorry for the lateness of this post - I lost my whole Monday, helping a friend out of a bind. Tuesday was spent getting my two microscope focusing devices ready to ship to two very patient photographers.

I hope you have a great week and don’t miss Thursday’s livestream - lots of really original stuff to tell you about!

Allan

Polarization in Macro Photography

Eupholus weevil dancing

I am occasionally asked how I come up with topics to discuss during my twice weekly livestreams. The topics come from several different sources. Most often, I am answering a question that was brought up by one of my students or asked by a livestream participant. If, when thinking about the question, I can expand on the topic to include interesting background and details, it will often become my subject for the week. But I also keep an ever-growing list of promising subjects that occur to me during my own exploration of macro photography and associated disciplines. The beauty of macro photography is that there are more fascinating topics to explore than I could cram into a lifetime of livestreams.

A moth

I try not to repeat myself and avoid talking about the same topic twice in the same year, and even when I do return to a previous conversation I try to emphasize information that has not been covered. I need to bear in mind that new viewers are going the streams every week and for many of them this may be the first time they have encountered the topic. Balancing the needs of the newcomer to macro with the seasoned experts that  are also in the audience every week is the hardest part of programming these events.

attacking bee

This week, for example, I am breaking from my usual practice of finding a common theme for both livestreams and instead will be addressing two distinctly different topics that came up in conversation over the preceding week. This has the advantage of keeping things interesting and relevant to more viewers, while keeping the process interesting for me at the same time.

On Tuesday I am going to  talk about the use of polarized light in macro photography. I don’t think I have ever discussed this subject as I plan to in this livestream. The question that prompted this was a practical one - “when should be using  polarizing filters in macro photography?” - and to answer that I need to explain a little about polarized light. So I will open with a discussion about light in general and the concept of polarity in the context of visible light. When we understand the nature of light and see how it can be polarized, everything else I talk about should make a lot more sense. For example I will explain the difference between using a polarized light source and polarizing the light that enters our camera through a polarizing filter. When do we want to use the former, when the latter, and I will introduce the concept of using both.

A closeup compound eye

For a subject to be useful for your photography it needs to have some practical application, so I will describe the various types of polarizing filters and give step by step recommendations on how they are used. By the end of the hour you should have everything you need to make wise decision about when and how to use polarization as well as information on the best brands of polarizing filters to look for. B&H carries a wide selection of the very best circular polarizing filters - you can find them here - https://www.bhphotovideo.com/c/search?Ntt=circular%20polarizing%20filters&N=0&InitialSearch=yes&sts=ps&BI=23366&KBID=28903&SID=DFF&DFF=d50

A B&W circular polarizing filter from b&h

If you would like to join the discussion, the link for the livestream is here - https://youtube.com/live/U2bcVTXrWzc?feature=share

On Thursday we are going to look at something completely different that I think should be of interest to many of you. What is the best tripod head for use in macro photography? I don’t think I have ever talked about this in any depth but it is quite interesting. For one thing, there are a lot more options than most people might be aware of, and they are not all equally ideal for close up work. I will describe all the different ways in which a camera can be mounted to a tripod (monopod, ground pod, camera stand, etc.) and discuss the relative merits and drawbacks of each. Based on my own experience I will make specific recommendations for each time of head and explain why I use each of them.

The amazing magic ball from novoflex

If you are thinking about adding or replacing a tripod head in your bag, here are a few of the products that I recommend and will be talking about during the livestream.

my favorite benro three way geared head

When it comes to ball heads you will have a hard time finding anything more versatile and well constructed than the Really Right Stuff BH55, available from B&H - https://www.bhphotovideo.com/c/product/1301057-REG/really_right_stuff_bh_55_pro_bh_55_ballhead_with_full_size.html/BI/23366/KBID/28903/DFF/d10-v21-t1-x781162/SID/DFF

Another contender at the top of the stack is the incredible Novoflex Magic Ball - a different take on the ball head but one that many of the best macro photographers swear by - https://www.bhphotovideo.com/c/product/153279-REG/Novoflex_MB_Magic_Ball_with_Socket.html/BI/23366/KBID/28903/DFF/d10-v21-t1-x1596924/SID/DFF

A gimbal head form sirui

For the more budget conscious photographer, Sirui makes a really lovely low profile ball head, the AM40 that is a little smaller than the RRS, but a lot less expensive - https://amzn.to/4hfVBVG

A quality fluid head from neewer

In the geared head category you will not find a better affordable three-way head than the Benro GD3WH that I use. I have ben using this for at least 6 years and I love it - https://amzn.to/3AaA93v

the perfect head for macro on a monopod

Another option if you jus have to have the best geared head on the planet is the original Arca Swiss cube, available from B&H - https://www.bhphotovideo.com/c/product/1373798-REG/arca_swiss_8501303_1_cube_c1_gp_geared.html/BI/23366/KBID/28903/DFF/d10-v21-t1-x861127/SID/DFF

I think a very fine alternative at a lower price point is the new Leofoto geared head, also from B&H - https://www.bhphotovideo.com/c/product/1796458-REG/leofoto_gw_01_3_way_geared_head.html/BI/23366/KBID/28903/DFF/d10-v21-t1-x1340748/SID/DFF

not strictly a tripod head, I like to use this leveling device for still life work

For anyone wanting a video friendly fluid head, a very attractive option is the new Neewer, shown above. It is sturdy and easy to use, while also being very affordable - https://amzn.to/3YcPZmo

The SmallRig DH10 is another excellent choice - https://amzn.to/4f3DvEm

I recommend a two axis head for use with a monopod and one of the best for the price is the Sunwayfoto DT-03S - https://amzn.to/3BTe0HA

B&H has a wide selection of other monopod heads - https://www.bhphotovideo.com/c/search?Ntt=monopod%20head&N=0&InitialSearch=yes&sts=ps&BI=23366&KBID=28903&SID=DFF&DFF=d50

The tripod head livestream link is right here - https://youtube.com/live/HYt2wfVEPc8?feature=share

If you are one of my Patreon Supporters, don’t forget we have a Pzoom this Saturday morning at 10AM and this week will be a mixed bag, with some introductions, updates on where to purchase bugs this winter, a book at my studio, and some discussion of idler platform stacking. Should be a fun morning! Your invitation is over on Patreon. If you are not one of my supporters but want to look into joining, please check out my Patreon page at https://www.patreon.com/allanwallsphotography

For anyone interested in the dark arts of 3D modeling and printing, Larry and I will be hosting Tangent at 12:30 on Saturday. For details, check out the Tangent page over on Discord. To join the fun, use this invitation

Topic: Tangent

Time: Oct 26, 2024 12:30 PM Central Time (US and Canada)

Join Zoom Meeting

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Meeting ID: 691 680 2815

Passcode: 678122

a dragonfly at rest

That’s all I have for you right now! Hope to see you tomorrow!

Allan

Exotic Optics

Macro photography is unique in a number of ways but one feature that makes it particularly exciting for me is the almost infinite variety of special optics that can be adapted for use at magnification. Macro lenses are, of course, purpose built for close-up imaging and, as you would expect, they run the gamut from  terrible to superb, with most falling somewhere in the middle. But what is even more interesting to me are the specialized lenses, usually designed for some specific purpose other than macro photography, that can be adapted for use as macro lenses. Some examples include optics designed for use as scanner lenses, close-up diopters, bellows lenses, enlarger lenses and a host of specialized industrial lenses. In each of these categories there are lenses that perform particularly well when adapted for macro. But there are a handful of lenses that really deserve to be placed in a special category all on their own because they set the standards by which other lenses or lens combinations are measured. These are the lenses I want to talk about this week and I call them Exotic Optics.

Phot by Mike Kanfer - used by permission

Exotic Optics is a somewhat arbitrary designation and you will see it used to describe lenses like Laowa’s probes, Nikon PC (Perspective Control) tilt/shift lenses, and Canon’s MPE-65 variable magnification lens, among others. But for the sake of this discussion I am going to define Exotic Optics to exclude these consumer-type lenses. The lenses I want to talk about are in a subgroup of optics that are relatively rare, typically very expensive, not designed or marketed for use on standard camera equipment, and were developed with a very specific use-case in mind. The one thing that all these lenses have in common is that they are highly sought after by macro photographers because of their extraordinary performance. These lenses are usually of a fixed focal length and typically, though not always, have a fixed magnification ratio. Many are designed to be used wide open, and perform best with a wide aperture. None of them come with a standard camera mount and some require complicated special adapter setups to use with a consumer camera.

Most of the lenses I will be talking about are “industrial lenses”, designed for use in a variety of industrial applications, from making prints in the motion picture industry, to scanning silicon wafers for quality control in computer chip fabrication. They are used in machine vision applications where the highest possible clarity and resolution are required. Because they are not made for consumer applications they frequently lack specialized coatings on the glass elements, and often have no external controls or markings. They are possibly the only lenses that are more intimidating for mere mortals to use than microscope objectives.

I must make a confession here… While I have made it my business to learn all I can about these rare and expensive lenses, I do not own any of them. The lenses I am going to talk about are on my wish list list and are even listed in the order that they appear on that list. Some of these lenses are not absurdly costly, but the less expensive exotics also seem to be the hardest ones to find on the used market. With almost no exception, these lenses must be sourced on the used market, or occasionally through an industrial surplus outlet. Virtually never would we find these lenses in a consumer retail outlet, and many of them have been out of production for decades. The selection of lenses I am going to talk about are all lenses that I have studied in detail and many of them have been carefully evaluated and written about on specialized websites like Closeuphotography.com (Robert O’tool), Photomacrography.net (Rik Littlefield), and Coin Imaging (various), and I know many individuals who own one or more of these Exotic Optics. For example, the cover of Tuesday’s livestream shows a PN150 2.8 Printing Nikkor belonging to movie industry-insider, Mike Kanfer.

Leica APO Macro-Summarit-S

The lenses that I am going to focus on are listed below:

1) Printing Nikkor PN150 f/2.8

2) Printing Nikkor PN105 f/2.8

3) Printing Nikkor PN95 f/2.8

4) Mejiro Genossen FLO530 f/4.0 110mm

5) Etendue Mejiro OTH100 90mm f/5.6

6) Schneider Kreuznach Macro Varon CAS 85 f/4.5

7) Rodenstock APO-Rodagon-D 75mm f/4.5

8) Leica Z-Macro 100mm f/4

9) Zeiss -S-Planar 60mm f/4

10) Kowa LM50HC 50mm f/2.0

11) Computar F-mount 100mm f/2.8

Rayfact by Nikon

You will notice that I have not included any of the excellent microscope objectives that could easily qualify for a spot on this list. That is mostly because we have talked about these lenses often and most of them are used for significantly higher magnification applications than these lenses. The optics I will discuss on Tuesday cover a range of magnifications from 1:4 up to 4X, though most are at or near 1:1. We will talk about the relative merits of each lens, why you might want one, and how much you can expect to pay, should you even be able to find one! The link to the livestream is here…https://youtube.com/live/4cwnV5LPQKw?feature=share

On Thursday we will continue our discussion of lenses by looking at the other end of the macro spectrum - affordable macro lenses. This will include both new and older macro lenses that can be bought new or on the used market at reasonable prices. Some of these lenses will surprise you, especially given the prices. We will stick to actual macro lenses, mostly from well known companies. Here is the link to the livestream…https://youtube.com/live/r8LuzT4lpRQ?feature=share

On Saturday we have Episode 8 of AfterStack with Bud Perrott - It starts at 10AM and you are invited! Here is the invitation:

Topic: Allan Walls' AfterStack with Bud Perrott

Time: Oct 19, 2024 10:00 AM Central Time (US and Canada)

Join Zoom Meeting

https://us02web.zoom.us/j/6916802815?pwd=TS9tZi9ZL1NXeVUvOUF4eTg5YjdlZz09&omn=83280587471

Meeting ID: 691 680 2815

Passcode: 678122

There was a problem downloading the recorded Episode 7, which is why the video has not yet been posted - I am working on a resolution and hope to have it up soon

On Thursday I talked about good, affordable macro lenses from many different companies - there was a lot of information to cover but here are links to every one of the lenses I talked about:

Key Characteristics to Look for

1. Focal Length: A range between 60mm and 100mm is ideal for versatility in macro photography. The longer the focal length, the more distance you have from the subject.

2. Magnification Ratio: All these lenses offer at least 1:1 magnification, crucial for true macro work.

3. Autofocus vs. Manual: Many affordable lenses are manual, but autofocus can be a bonus if speed is important.

4. Image Stabilization: Not all lenses have it, but it's a valuable feature for handheld macro photography.

5. Build Quality: These lenses are known for their sturdy construction, especially those from third-party manufacturers like Tokina and Tamron.

Here are the lenses - note that the links are affiliate links, meaning I may make a small fee from Amazon if you buy one of these using the links below:

1. Tamron SP 90mm f/2.8 Di VC USD Macro (New/Used)  $700

     https://amzn.to/3UcYRau

• Why: This lens is renowned for its sharpness, color rendition, and image stabilization (VC), which helps in handheld shooting. It's competitively priced new, and even more affordable used. Its autofocus is also snappy and reliable.

1b.  Tamron 60mm f/2 Di II LD Macro (New/Used) APSC $390

          https://amzn.to/48d4tXU

• Why: Another strong showing from Tamron, this lens offers a fast f/2 aperture, making it ideal for low light. It’s designed for APS-C sensors but offers excellent sharpness and affordability.

1c.  Tamron 90mm f/2.8 Di Macro (Older Version) (Used) $300

       https://amzn.to/3zSE0Cl

• Why: The predecessor to the current 90mm Tamron macro lenses, this older version is still a fantastic performer and can often be found at very low prices on the used market. While it lacks the newer VC stabilization, its optics are still impressive.

2. Tokina AT-X 100mm f/2.8 PRO D Macro (New/Used)    older version $298

    https://amzn.to/3NyFlRG

• Why: Tokina lenses have a cult following among macro photographers for their solid build and impressive optical quality. This one delivers sharp images with pleasing bokeh at a fraction of the cost of more premium brands. A great budget-friendly choice.

2b  Tokina ATX-i 100mm f/2.8 FF (the new lens) $408

       https://amzn.to/3Nujif5

3. Laowa 90mm f/2.8 2:1 APO Macro (new version) $500

          https://amzn.to/3AaK1u0

• Why: This fully manual lens offers an impressive 2:1 magnification at a relatively low cost. While it doesn’t have autofocus or stabilization, its macro capabilities are stellar, especially for the price.

3b  Laowa 65mm f/2.8 APO 2X $400

       https://amzn.to/4dUKeiO

3c. Laowa 100mm f/2.8 APO 2X $500

       https://amzn.to/4eP9JDy

4. Sigma 105mm f/2.8 EX DG DN Macro Art (new) $800

    https://amzn.to/3Nv1pg8

•    Why: Sigma lenses are known for their sharpness, and this one comes with optical stabilization (OS), which is a nice bonus. While no longer a new model, it's an excellent used option and often found at a great price.
  

4b  Sigma 105mm F2.8 EX DG OS HSM Macro Lens  $540

       https://amzn.to/4eM3iB5

5. Canon EF-S 60mm f/2.8 Macro USM (Used) $480

    https://amzn.to/489QbHA

• Why: A compact, lightweight, and sharp lens, it’s great for crop-sensor users and offers excellent performance for its price. It’s very portable and offers accurate autofocus.
  

5b Canon RF100 f/2.8 L   $1000

      https://amzn.to/3A0Lrr8

7. Nikon AF-S Micro-NIKKOR 105mm f/2.8G ED -“renewed” for $550

• Why: Nikon’s optics are always solid, and this iconic 105mm macro lens is no exception. It's sharp, compact, and delivers great results for macro and portraiture. A great used buy.

7b.  Nikon Z MC105 f/2.8 new - $1050

       https://amzn.to/409AVIx

7c.  Nikon Z MC50 f/2.8 - new - $650.

       https://amzn.to/48avj2J

7d. Micro-Nikkor 85 f/3.5. for APSC   $500

       https://amzn.to/3Yt4OTc

8. Olympus M.Zuiko Digital ED 60mm f/2.8 Macro (New/Used) $479.  MFT

     https://amzn.to/4h9f4ak

• Why: For Micro Four Thirds users, this lens offers superb sharpness and 1:1 magnification. It’s compact and weather-sealed, making it a reliable option for outdoor macro photography.

9. Sony FE 50mm f/2.8 Macro (New/Used)  $1,100.

       https://amzn.to/4faLm35

• Why: This lens is affordable for Sony's full-frame E-mount system and offers great 1:1 magnification. It’s compact, sharp, and versatile, though a bit shorter in focal length than the others.

9b. Sony FE 100mm f/2.8 - also $1,100

       https://amzn.to/3YsY6wr f

Honorable Mentions

TTArtisan 100mm f/2.8 2X for FF.  $339

https://amzn.to/4dQPd3W

Astr-Hori 25mm 2-5X   $250

https://amzn.to/3A1RBXX

Astr-Hori 120mm f/2.8 manual  $370

https://amzn.to/4dWdA0i

7Artisans 60mm f/2.8 manual APSC  $150

https://amzn.to/3Y9hwF9

AsttHori85mm f/2.8 tilt FF $330

https://amzn.to/4fr11LR

Viltrox, Samyang, Fuji, Brighton Star, Meike also make low cost manual macro lenses but I have not used any of them and cannot recommend them until I have