Search found 2885 matches

by Chris S.
Thu Oct 29, 2020 1:44 pm
Forum: Equipment Discussions
Topic: Use of 3D-printer in close-up photography
Replies: 9
Views: 279

Re: Use of 3D-printer in close-up photography

Lex, Very nice contribution to the community! :D We have a FAQ: 3D models started and mostly used by Saul, but available to anyone: We can use this thread as a list of resources, and links out to discussions in the main forum. In this FAQ, Saul has been storing the files at the site www.thingiverse....
by Chris S.
Sun Oct 25, 2020 1:30 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Laser aiming and focus in photomacrography
Replies: 44
Views: 41820

Re: Laser aiming and focus in photomacrography

Of course this doesn't seem very practical. Can't argue with that. :) Oddly, it seems eminently practical to me. Another solution would be to replace the lens tube (in an infinite system) with a cage system (such as available from Edmund Optics and Thorlabs) with a hole on top. Then just drop the l...
by Chris S.
Sun Oct 25, 2020 1:16 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Laser aiming and focus in photomacrography
Replies: 44
Views: 41820

Re: Laser aiming and focus in photomacrography

Here's the simplest design I could think of. The laser diode is forced into a tight fitting hole. Perhaps this is not up to long time usage and in that case I'll have to find a piece of aluminium tube that can be glued into the base. Iconoclastica, Thanks much for posting your solution (pictured in...
by Chris S.
Sun Oct 25, 2020 1:12 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Laser aiming and focus in photomacrography
Replies: 44
Views: 41820

Re: Laser aiming and focus in photomacrography

How could this be made to work with mirrorless? I've given this considerable thought. My sense is that the laser should be placed in the infinity space between camera and tube lens. An implementation that appeals to me is a 45 degree mirror on a flip-out arm (flip out for laser aiming/focus, flip i...
by Chris S.
Sat Oct 24, 2020 12:27 pm
Forum: Equipment Discussions
Topic: Out, out ##### spots!
Replies: 13
Views: 291

Re: Out, out ##### spots!

ROR is a commercial product for cleaning lenses and other things. ROR is an acronym for "Residual Oil Remover." Rounding off the numbers in the MSDS , ROR consists of: Distilled Water 85% Liquid Soap 9% Isopropyl Alcohol 4% Sodium Chloride 1% Ammonia 1% The official ROR website hails the product wit...
by Chris S.
Fri Oct 23, 2020 8:43 pm
Forum: Equipment Discussions
Topic: Out, out ##### spots!
Replies: 13
Views: 291

Re: Out, out ##### spots!

Btw, can I use my normal camera lens cleaning fluid and lens tissue (PecPad) on an objective? Good enough for my 600mm, but maybe that's not relevant either. ;-) I don't know what's in your normal lens cleaning fluid. I use ethyl or isopropyl alcohol for cleaning lenses, or if a lens is very grungy...
by Chris S.
Fri Oct 23, 2020 5:20 pm
Forum: Equipment Discussions
Topic: Out, out ##### spots!
Replies: 13
Views: 291

Re: Out, out ##### spots!

Thanks, Chris. (I've also got the 20x ;-)) Dennis, I didn't mention your 20x, because a 20/0.42 equates to f/24--revealing of dust, but not so ruthlessly as your 50x(f/45) or 100x (f/71). It's those tiny effective apertures that make dust appear in focus on your sensor. In modern, regular photograp...
by Chris S.
Fri Oct 23, 2020 4:50 pm
Forum: Equipment Discussions
Topic: Mitutoyo QV 3d Usage
Replies: 4
Views: 237

Re: Mitutoyo QV 3d Usage

https://zookeys.pensoft.net/article/24584/ That article is well-worth a look--particularly the supplemental document that goes into wonderful detail on the how and why of each element in the design and processing. I thought of the QV or the Nikon Measuring, you can think of other telezentic lenses ...
by Chris S.
Fri Oct 23, 2020 12:31 pm
Forum: Equipment Discussions
Topic: Out, out ##### spots!
Replies: 13
Views: 291

Re: Out, out ##### spots!

My guess is that it's sensor dust. You didn't mention which objective you're seeing this with, but I know that you have objectives that are effectively f/71 (Mitutoyo 100/0.70) and f/45 (Mitutoyo 50/0.55). These are ruthlessly revealing of sensor dust. I clean camera sensors under a stereo microscop...
by Chris S.
Tue Oct 20, 2020 11:45 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Laser aiming and focus in photomacrography
Replies: 44
Views: 41820

Re: Laser aiming and focus in photomacrography

Pau, what an elegant implementation! :D Thanks for posting it. Looks like a great approach for Canon bodies with similar eyepieces. I'd not heard of "12mm diameter plastic tube wall fixation." Am glad to be aware of it now. At present, I'm working on a version for another forum member. When finished...
by Chris S.
Fri Oct 16, 2020 8:44 pm
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 48
Views: 1897

Re: New Mitutoyo apo 10x

(FYI, the "-2" I'm referring to is indicated on the objective canister, you can see it suffixed to the model number, -2 is the second version. Newest versions have the -3 tag". While the canister clearly does say "-2", it also appears to say "5x" (though it's fuzzy in the image). If so, this is not...
by Chris S.
Thu Oct 15, 2020 10:34 pm
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 48
Views: 1897

Re: New Mitutoyo apo 10x

Many forum members are starting to get standardized wafers as resolution targets, and this will give us the ability to test and compare our objectives against a common standard. Lou, I'm less than optimistic about the usefulness of distributed testing on standardized wafers, for a bunch of reasons ...
by Chris S.
Wed Oct 14, 2020 8:48 pm
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 48
Views: 1897

Re: New Mitutoyo apo 10x

First the good news: I've tested more Mitutoyo objectives than I can count, and inspected all of them visually as a first step. I see nothing unusual or disturbing shown in any of the images you've posted. Now the bad news: The visual appearance of a Mitutoyo objective tells you very little. I did o...
by Chris S.
Mon Oct 12, 2020 9:50 pm
Forum: Equipment Discussions
Topic: Canon EOS RP + Sigma 150mm Macro + Nikon CFI Plan 10x
Replies: 4
Views: 408

Re: Canon EOS RP + Sigma 150mm Macro + Nikon CFI Plan 10x

Nice demo! :D

I had to look up jaggery, as I'd never heard of it. Sounds tasty.

--Chris S.
by Chris S.
Sun Sep 27, 2020 7:57 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Mitutoyo blemishes... or inflated expectations?
Replies: 7
Views: 617

Re: Mitutoyo blemishes... or inflated expectations?

Lou, Agreed that if this lens has been disassembled, it's junk. However, from the images Greg linked to, I'm not sure that anyone has disassembled this lens. Looking into an objective can fool the eye (or at least my eyes)--things are not always in the location they appear to be. I wouldn't condemn ...