Macro rig

Have questions about the equipment used for macro- or micro- photography? Post those questions in this forum.

Moderators: ChrisR, Chris S., Pau, rjlittlefield

Saul
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Post by Saul »

Rik, thank you for your comment !
makes me think that your setup has the rear lens focused somewhere other than infinity
Rechecked - you are right ! Before I focused my tube lens to the distant tree. I had to focus to the "very very" distant tree :( This difference gave me wrong understanding, that I can make "micro" magnification adjustments by changing distance between tube lens and objective.

Thanks for the link. Few years ago in the the printed Edmund catalog version I saw very similar information (not available in the later editions)
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Question...
It is important to note that 76.5mm is the recommended distance since these objectives are infinity corrected. However, if the distance is too short, the system may experience vignetting
How too short distance can cause vignetting ? In the combination with the normal 200mm (70-200 other members or 70-300 in my case) lens we are trying to keep objective as close as possible . With Sigma Life size attachment - same story ( with bigger distance results were not good). When I tested Mitutoyo 5x/Reichert tube lens, gap was around 1cm and results were pretty good
http://www.photomacrography.net/forum/v ... hp?t=30766

Am I missing something ?
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Saul
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Post by Saul »

Updated head version

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... and some details

http://www.photomacrography.net/forum/v ... hp?t=30985
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Saul
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Post by Saul »

As I mentioned in the one of the previous posts, I was looking for something to replace my horizontal setup which could be used in the field and studio and could be used in the manual and auto modes.
http://www.photomacrography.net/forum/v ... ht=deltron

Finally my purchase has arrived... Assembly took few minutes, except 1/4 hole for the tripod at the bottom - had to spend some time to assemble back linear bearings.

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Movement is ~2.0 - 2.5mm per turn, what is OK for my horizontal lower magnification shots. For the high magnification I'm using vertical setup
Last edited by Saul on Tue Feb 21, 2017 10:51 pm, edited 1 time in total.
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Saul
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Post by Saul »

One more update for the focus stacking setup head ( I hope it is last one ... ).

Changes:
-shortened nosepiece with bracket. Now it allows me easily interchange different parts.
-shortened trinocular head top port "neck" - now I can keep infinity distance between sensor and Sigma Life size attachment - no need to use original Reichert tube lens (which is little bit worse than Sigma ) inside trinocular head and allows to use finite objectives when needed.

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Saul
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Post by Saul »

Mitutoyo/Reichert tube lens assembly for Nikon Labophot. Missed something in the 3D model, had to adjust manually.

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Saul
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Post by Saul »

Horizontal setup with Del-Tron

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Saul
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Post by Saul »

Most recent vertical setup with Labophot base

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rjlittlefield
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Post by rjlittlefield »

I had forgotten this thread, and I see that one of your earlier questions went unanswered.
Saul wrote:Question...
It is important to note that 76.5mm is the recommended distance since these objectives are infinity corrected. However, if the distance is too short, the system may experience vignetting; if the distance is too long, the resultant image will be dim because of insufficient light.
How too short distance can cause vignetting ?
...
Am I missing something ?
No, you're not missing anything. The author of that bit was confused.

If the distance is too short, the system may experience aberrations (depends on the tube lens), but short distance certainly will not add vignetting.

I have added to your quote the original continuation, about if the distance is too long, the resultant image will be dim because of insufficient light. This is not quite correct either, but there is a grain of truth in it. No light is lost due to distance per se. However, if the distance becomes too long then vignetting will start to occur, and the first symptoms of that will be corner darkening as edge rays are blocked.

--Rik

Saul
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Post by Saul »

rjlittlefield wrote:I had forgotten this thread, and I see that one of your earlier questions went unanswered.
Thanks Rik ! Looks like bottom line is - balance between vignetting and aberrations.
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microman
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Post by microman »

Interesting setups, thanks for sharing.

Saul
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Post by Saul »

rjlittlefield wrote:... If the distance is too short, the system may experience aberrations...
Thanks Rik, sorry for the late reply !
So, only way to check aberrations - make tests at the different distances between objective and tube lens ?
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Saul
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Post by Saul »

Small improvement to my Labophot stacking base - I got it without the light, had to use Jansjo through the back opening. Few cheap ebay parts - 10W led 272389345999 , heatsink 182195476144 & LED dimmer 282671724717 - now I have a comfort adjusting background brightness

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Smokedaddy
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Post by Smokedaddy »

Sweet setup Saul.

Saul
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Post by Saul »

Smokedaddy wrote:Sweet setup Saul.
Thanks James, it keeps my blood pressure lower :wink:
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ChrisR
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Post by ChrisR »

Are you happy with the spectrum of the LED?
Chris R

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