Search found 17994 matches

by rjlittlefield
Mon Jan 25, 2021 2:56 pm
Forum: General Discussion Forum and Community Announcements
Topic: Trouble getting into site.
Replies: 1
Views: 40

Re: Trouble getting into site.

I'm guessing that by "search box", you must mean the place at top of your browser that used to be reserved for URL's. The problem then must be that instead of taking your type-in to be a URL and just going there, the browser, or more likely a search engine plugin, is treating it as a search string a...
by rjlittlefield
Mon Jan 25, 2021 10:50 am
Forum: Equipment Discussions
Topic: New 1.4x Lens Test Results Online
Replies: 34
Views: 1198

Re: New 1.4x Lens Test Results Online

lothman wrote:
Mon Jan 25, 2021 1:08 am
is there a possibility to upload such testpics bigger than 1024 pixel to the forum?
No, the forum upload software has a strict limit of 1024 pixels.

--Rik
by rjlittlefield
Mon Jan 25, 2021 10:43 am
Forum: Beginners Micro
Topic: First few days of micro
Replies: 10
Views: 227

Re: First few days of micro

Thanks again. I think I have considerable experimenting to do. You're very welcome. Keep us informed, please. ...very generous with your time. I look on exchanges like this as being a win-win learning experience. One of the problems I have is that it's no longer possible for me to see focus stackin...
by rjlittlefield
Mon Jan 25, 2021 10:35 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: mountain swallowtail
Replies: 20
Views: 809

Re: mountain swallowtail

That's a beautiful image!

Those claws look like my desktops -- not really "dirty", but cluttered with left over bits of stuff from previous activities.

--Rik
by rjlittlefield
Sun Jan 24, 2021 8:41 pm
Forum: Beginners Micro
Topic: First few days of micro
Replies: 10
Views: 227

Re: First few days of micro

The attached are unretouched DMAP Probably you've noticed the bold "swirly" halos in the first image. Those are typical of a 3D structure that has detailed foreground obscuring detailed background, with a sharp edge or even an overhang separating the two regions in depth. Different stacking methods...
by rjlittlefield
Sun Jan 24, 2021 7:25 pm
Forum: Equipment Discussions
Topic: Advices for enlarger lens
Replies: 17
Views: 262

Re: Advices for enlarger lens

The lens are, a componon-S 2.8/50 and a componon 28mm f/4. Not sure about El-Nikkor 50mm f:2.8. I read, also on closeuphotography.com that they will work at their best, coupled with a rear lens. The question is, which one do you advise easily to find online? I found the Makro-Symmar 5.9/120 but the...
by rjlittlefield
Sun Jan 24, 2021 3:12 pm
Forum: Equipment Discussions
Topic: New 1.4x Lens Test Results Online
Replies: 34
Views: 1198

Re: New 1.4x Lens Test Results Online

Your image is not coming up, but I tried the link and the image works with a browser app. The problem here is that the host for the image, www.lolux.de, does not work with HTTPS (secure HTTP). There is some problem with its certificate. The reason that's a problem is that some browsers, notably Chr...
by rjlittlefield
Sat Jan 23, 2021 5:02 pm
Forum: Beginners Micro
Topic: First few days of micro
Replies: 10
Views: 227

Re: subject drifting

By checking "Align each frame against first frame separately" in Preferences, all frames line up. To clarify... For normal focus stacking, you'll get equal or better results by leaving that option at its default setting, which is not checked. The option is provided for high precision measurement ta...
by rjlittlefield
Sat Jan 23, 2021 2:36 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Nice mineral
Replies: 4
Views: 177

Re: Nice mineral

This last image is a significant improvement in the light.

I notice that the image is posted in "Nature Photography", but with 1300 frames I am thinking it should be in "Technical & Studio Photography". I will move it after you've had a chance to see this comment.

--Rik
by rjlittlefield
Sat Jan 23, 2021 2:31 pm
Forum: Beginners Micro
Topic: First few days of micro
Replies: 10
Views: 227

Re: First few days of micro

Brad, Thank you for the further information. The possibility of softening due to subject movement had not occurred to me. In normal circumstances, all the stacking programs will automatically correct for simple shifts across the frame. However, if the subject does not sit in a stable position, or if...
by rjlittlefield
Fri Jan 22, 2021 9:44 pm
Forum: Beginners Micro
Topic: First few days of micro
Replies: 10
Views: 227

Re: First few days of micro

Welcome to the world of high mag stacking! For background and disclosure, I'm the fellow who wrote Zerene Stacker. I also answer all of its email requests for support. So, my comments here will be from the background of having helped hundreds of other people in that role, in addition to my postings ...
by rjlittlefield
Mon Jan 18, 2021 12:43 pm
Forum: Photography Through the Microscope
Topic: ...two little babies on the way...
Replies: 6
Views: 230

Re: ...two little babies on the way...

Thanks for including the original. That matches pretty close to what I got by inverting the lightness channel in an Lab version of your post at top of thread. But it does not match exactly, so now I am curious. I notice that in your original, the eyes are very dark, almost black. With inverted lumin...
by rjlittlefield
Mon Jan 18, 2021 10:41 am
Forum: Photography Through the Microscope
Topic: ...two little babies on the way...
Replies: 6
Views: 230

Re: ...two little babies on the way...

Excellent -- and that is a very clever trick, to invert just the luminosity channel so as to convert brightfield to darkfield while preserving colors!

--Rik
by rjlittlefield
Sun Jan 17, 2021 10:45 am
Forum: Equipment Discussions
Topic: 50X objective recommendation
Replies: 31
Views: 1241

Re: 50X objective recommendation

With regards to focus blocks, the well regarded Olympus BHMJ is actually quite expensive. Would something much cheaper (e.g. https://www.ebay.com/itm/Stereo-Microscope-Adjustment-Coaxial-Coarse-and-Fine-Focusing-Arm-E-Head-Holder/273448954661) be equally suitable/capable? Very interesting! Today's ...
by rjlittlefield
Thu Jan 14, 2021 12:12 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Looking for advice to improve sharpness
Replies: 7
Views: 378

Re: Looking for advice to improve sharpness

Viewing your image at full resolution (5496 x 3864), I see a lot of lateral chromatic aberration -- color fringes away from center on light vs dark transitions. That is a property of the objective. You can eliminate the obvious fringing with post-processing in Photoshop and similar tools, but fringi...