Search found 1681 matches

by Beatsy
Fri Apr 16, 2021 4:58 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Darkfield Microscopy... is it that easy?
Replies: 4
Views: 187

Re: Darkfield Microscopy... is it that easy?

Yep, except for high NA objectives as noted by others. You need a darkfield condenser oiled to the slide for anything >NA0.95. I used to have a Zeiss NA1.4 DF condenser, but I lost it in a move (I think). But losing the proper tool for the job led me to discover that simply shining a bright torch or...
by Beatsy
Tue Apr 13, 2021 1:26 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: High key contrast method (post-processing tip)
Replies: 9
Views: 368

Re: High key contrast method (post-processing tip)

Haha. I shall bask in the warm glow of vindication courtesy of Lou and Rik. Well, "for the moment", at least :D Thanks both. In my haste I forgot to sharpen the final one for output. Here it is, in conclusion, with final adjustments. This is more like the view I "saw" (perceived? interpreted? imagin...
by Beatsy
Tue Apr 13, 2021 1:46 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: High key contrast method (post-processing tip)
Replies: 9
Views: 368

Re: High key contrast method (post-processing tip)

... But it doesn't quite do enough to get the wider tonal changes needed for those near-white background highlights (with the smooth tonal transition to the yellows). Step 3 in my example above was a rough placeholder. Would a curves adjustment serve your purpose--adjusting both the lightness and t...
by Beatsy
Mon Apr 12, 2021 11:23 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: High key contrast method (post-processing tip)
Replies: 9
Views: 368

Re: High key contrast method (post-processing tip)

Thanks Chris, that was my first thought (and attempt). The "L" in lab is "Luminance" and it does indeed give you a greyscale image representing luminance which can be manipulated as you suggest. But it doesn't quite do enough to get the wider tonal changes needed for those near-white background high...
by Beatsy
Mon Apr 12, 2021 2:47 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: High key contrast method (post-processing tip)
Replies: 9
Views: 368

High key contrast method (post-processing tip)

Just posting to show a method I sometimes use to get a (kind of) high-key contrasty look with heavily cropped images. The images naturally dropped out of the process and I thought the technique might be novel to a few. This is just *a* method, not best, or even any good at all in many applications, ...
by Beatsy
Sun Apr 11, 2021 1:29 am
Forum: Equipment Discussions
Topic: Pixel shift vs no shift example
Replies: 25
Views: 504

Re: Pixel shift vs no shift example

I actually do use a "light" version of stitching for my scientific work. It is convenient because it doesn't need a separate set-up. I use medium format tube lenses with a shift adapter to a Nikon camera mount. I just do two or sometimes three tiles to catch some protruding tail-like features that ...
by Beatsy
Fri Apr 09, 2021 3:19 pm
Forum: Equipment Discussions
Topic: Pixel shift vs no shift example
Replies: 25
Views: 504

Re: Pixel shift vs no shift example

Macrero wrote:
Fri Apr 09, 2021 3:05 pm
...
That being said, I change cameras every time I get bored and I get bored quite often so please don't judge me if my next camera has piexl-shift :( :mrgreen:
Perhaps even a medium format camera with pixel shift 😁
by Beatsy
Fri Apr 09, 2021 11:22 am
Forum: Equipment Discussions
Topic: Pixel shift vs no shift example
Replies: 25
Views: 504

Re: Pixel shift vs no shift example

Print quality will depend on various factors. The number of pixels matters, of course. I don't believe there is such thing as "medium format look" though. Not to mention how difficult (and expensive) it would be to work in a wide magnification range with a MF camera. If you need high resolution ima...
by Beatsy
Fri Apr 09, 2021 8:04 am
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 399

Re: A7r4 pixel shift. Rather a resolution eye-opener

I wonder, why options only are FF(36x24) or APS-C-mode(24x16)... Wouldn't it be better to use square crop (24x24mm), from the FF picture, so no field is wasted? You're quite correct, it would be, but I had to allow for system/kit limitations too... Full-frame 16-shot pixel shift is far too "heavy" ...
by Beatsy
Thu Apr 08, 2021 11:13 am
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 399

Re: A7r4 pixel shift. Rather a resolution eye-opener

Hi Beatsy, which 135mm lens did you use for this test? I remember you had a fancy 135mm (Samyang/Rokinon? or Zeiss?) which you rejected because of vignetting. In crop mode that wouldn't be a problem. I like my cheap Vivitar-Komine 135mm but my Sigma Art 135mm gives better results, apart from hard v...
by Beatsy
Thu Apr 08, 2021 11:07 am
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 399

Re: A7r4 pixel shift. Rather a resolution eye-opener

Just tried 5x and 10x Mitties on a 200mm tube lens for nominal rated magnifications. Still shooting 16-shot pixel shifted, crop mode, same specimen, tweaked lights. Pics below. Note: no non-pixel-shifted comparisons as it's too onerous in the workflow. This was all just to see if the extra (virtual)...
by Beatsy
Thu Apr 08, 2021 2:04 am
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 399

Re: A7r4 pixel shift. Rather a resolution eye-opener

... Rik and I have shown through tests that good lenses and objectives far outresolve our sensors: https://www.photomacrography.net/forum/viewtopic.php?f=25&t=28958&p=178314&hilit=fz300#p178314 I estimated that an APS-C sensor should have at least 120Mp to do justice to a Mitutoyo 10x. ... Hi Lou, ...
by Beatsy
Thu Apr 08, 2021 12:23 am
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 399

Re: A7r4 pixel shift. Rather a resolution eye-opener

Here is an article on the topic by Jim Kasson. https://blog.kasson.com/the-last-word/does-pixel-shift-increase-resolution/ Unfortunately the body of that article has one significant flaw, and the subsequent discussion in comments is beyond my patience to try untangling. ... So, the article's conclu...
by Beatsy
Thu Apr 08, 2021 12:18 am
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 399

Re: A7r4 pixel shift. Rather a resolution eye-opener

Hi Beatsy, ...The most amazing gains from Pixel Shift Multi Shoot mode in my eyes? Less demosaicing artifacts which means less stair-stepped lines, and less noise/more dynamic range. I posted some examples in the test somewhere. Was going to post them here but I don't want to hijack your thread. :-...
by Beatsy
Thu Apr 08, 2021 12:12 am
Forum: Equipment Discussions
Topic: A7r4 pixel shift. Rather a resolution eye-opener
Replies: 17
Views: 399

Re: A7r4 pixel shift. Rather a resolution eye-opener

I found similar improvement of Pixelshift of A7riv on the Laowa 2,5-5x macro lens http://www.photomacrography.net/forum/viewtopic.php?f=27&t=43097 But I have no clue how I could handle all those files when stacking. The size and amount of files can cause issues - particularly with anything but the ...