Q: circular polar filter/analyzer for DSLR+tube lens+plan APO setup?

Just bought that first macro lens? Post here to get helpful feedback and answers to any questions you might have.

Moderators: rjlittlefield, ChrisR, Chris S., Pau

jac B
Posts: 31
Joined: Tue Jul 14, 2020 2:01 am

Q: circular polar filter/analyzer for DSLR+tube lens+plan APO setup?

Post by jac B »

Hi,

I want to start with dead wild bees macro photography (full frame DSLR) via a microscope infinity optical system (infinity corrected objective lens): DSLR+tube lens+plan APO. See my previous topic “microscope infinity optical system setup for wild bees macro photography?” (http://www.photomacrography.net/forum/v ... 28&t=42119), which topic is relevant for this topic.

I read the topics:
-“Polarizer for Mitutoyo” (http://www.photomacrography.net/forum/v ... er#p240112);
-“The Bratcam gets a Mitutoyo tube lens” (http://photomacrography.net/forum/viewtopic.php?t=12880);

What are the latest insights, namely: Can you show your filter holder and circular polar filter/analyzer setup for your DSLR+tube lens+plan APO setup? Specifically:
-where and why is the filter holder (at best) positioned: a) between plan APO and tube lens (M26, SM1 or SM2 mount) or b) between tube lens and (tube lens - DSLR) adapter?
-how is the filter holder and plan APO supported, e.g. with a slip ring?
-which components are used;

Which supplier(s) offer (off the shelf) filter holder and circular polar filter/analyzer for DSLR+tube lens+plan APO setup?

Regards, Jac

ChrisR
Site Admin
Posts: 8662
Joined: Sat Mar 14, 2009 3:58 am
Location: Near London, UK

Re: Q: circular polar filter/analyzer for DSLR+tube lens+plan APO setup?

Post by ChrisR »

Sorry you didn't get an answer ( I don't think it was covered inthe later post)
Chris S. is away at the moment, and I'm not sure if he fitted a n analyzer to his Bratcam. He'll be happy to give details if he did.

Between the Objective and the"tube" lens the bundles of light are parallel (if tube lens distance from the sensor were correct), which is what makes it the right place for optical interruptions. You wouldn't get dispersion from the light going through the glass at an angle.
I note you wrote Circular polarizer - you need a Linear polarizer, just a small round one which is probably what you meant! Ebay seller jinfinance sells pol filters in eg 42mm mounts - it depends what adapters you're using.
Chris R

Post Reply Previous topicNext topic