Search found 266 matches

by chris_ma
Thu Jan 07, 2021 2:54 pm
Forum: Equipment Discussions
Topic: Monochromatic Microscopes?
Replies: 21
Views: 621

Re: Monochromatic Microscopes?

there are some cool looking ones out there. like this one: https://www.ebay.com/itm/Giant-Photolithography-Photo-Lithography-Lens-Water-Cooled-38-x-20-x-10-dia/164109210778?hash=item2635abd49a:g:lbYAAOSw0w5eXuh4 also love the description: "Optical properties: really really big" at 38" x 20" x 10" th...
by chris_ma
Sun Jan 03, 2021 5:25 pm
Forum: Equipment Discussions
Topic: Touptek cameras / software and framerate
Replies: 2
Views: 223

Re: Touptek cameras / software and framerate

Hi, I have no experience with that camera system but a bit with machine vision cameras in general. first thing I would do is find out more about the bottle neck. do you know if the camera transmits the RAW images or does it a internal debayer and sends out full RGB images? if it's the latter, that m...
by chris_ma
Sat Jan 02, 2021 12:09 pm
Forum: Equipment Discussions
Topic: New 1.4x Lens Test Results Online
Replies: 24
Views: 598

Re: New 1.4x Lens Test Results Online

the Nikon Scanner lens has impressive resolution, but seems not as clean as the other top contenders - like on the Xerox letters there's some haloing going on, so I'm not sure if I'd put it on the top spot. I did notice that. On small details its best but on some larger details its not the case. DO...
by chris_ma
Sat Jan 02, 2021 4:22 am
Forum: Equipment Discussions
Topic: New 1.4x Lens Test Results Online
Replies: 24
Views: 598

Re: New 1.4x Lens Test Results Online

Great way to start the new year :) lovely write up as always. a minor point: on the Minolta the optimal magnification isn't listed (I think it's designed for about 1.8x?) the Nikon Scanner lens has impressive resolution, but seems not as clean as the other top contenders - like on the Xerox letters ...
by chris_ma
Tue Dec 29, 2020 11:35 am
Forum: Equipment Discussions
Topic: Rodenstock Scitex LFOV 108mm f/5.6 Lens Test Results
Replies: 8
Views: 341

Re: Rodenstock Scitex LFOV 108mm f/5.6 Lens Test Results

interesting test and great write up, thanks Robert. I specially liked that you included the original mounting mechanism of the scanner, very interesting construction. looking forward to the 1.4x results, I suspect the Macro Varon will be hard to beat. on the exotic list another interesting one would...
by chris_ma
Sat Dec 05, 2020 2:10 am
Forum: Equipment Discussions
Topic: Fuji GFX 100 pixel shift update
Replies: 4
Views: 1102

Re: Fuji GFX 100 pixel shift update

thanks a lot for those tests, they are very helpful to me to make a decision if it makes sense for me to upgrade. also interesting about the differences in certain places, I can't really imagine how that happens - maybe because of a combination of dead pixels and debayer interpolation, and if the se...
by chris_ma
Tue Dec 01, 2020 3:10 pm
Forum: Equipment Discussions
Topic: Awakening a Leitz SM microscope
Replies: 22
Views: 2137

Re: Awakening a Leitz SM microscope

I don't know anything about microscopes but I also like the images a lot, and also the presentation with it's attention to detail (image border, labeling etc)

thanks for sharing them
by chris_ma
Fri Nov 27, 2020 6:29 pm
Forum: Equipment Discussions
Topic: Fuji GFX 100 pixel shift update
Replies: 4
Views: 1102

Fuji GFX 100 pixel shift update

the Fuji GFX 100 finally got the long announced pixel shift update for 400MP files. here's a page with a good summary: https://www.fujirumors.com/fujifilm-gfx100-pixel-shift-first-tests-single-shot-raw-vs-pixel-shift-dng-files-to-download-and-new-eye-autofocus-feedback/ there's a link to a flicker p...
by chris_ma
Fri Nov 27, 2020 11:00 am
Forum: Equipment Discussions
Topic: first test of my Sigma 105mm F2.8 DG DN Macro Art
Replies: 16
Views: 2443

Re: first test of my Sigma 105mm F2.8 DG DN Macro Art

yeah, it's not strictly necessary, and I probably could use lens profiles (although I imagine it would be hard to create them to the same precision), but it is a good feeling to know that even the RAW files are undistorted and it makes stitching easier. 1 pixel on a 40MP camera is about 0.00025 (or ...
by chris_ma
Fri Nov 27, 2020 3:15 am
Forum: Equipment Discussions
Topic: first test of my Sigma 105mm F2.8 DG DN Macro Art
Replies: 16
Views: 2443

Re: first test of my Sigma 105mm F2.8 DG DN Macro Art

Hi Lou, yes, that makes sense, and for most purposes it's an excellent trade off. In some of my technical uses distortion (or rather the lack there off) is critical (like 1 pixel at the edges), so I'm a bit over sensitive. I'm planning to rent the sigma eventually and compare it to some reference li...
by chris_ma
Thu Nov 26, 2020 4:46 pm
Forum: Equipment Discussions
Topic: first test of my Sigma 105mm F2.8 DG DN Macro Art
Replies: 16
Views: 2443

Re: first test of my Sigma 105mm F2.8 DG DN Macro Art

thanks for the sample images.
quite a bit of distortion - is that around 1:1?
by chris_ma
Mon Oct 26, 2020 3:40 pm
Forum: Equipment Discussions
Topic: Looking for a compact, rugged camera
Replies: 6
Views: 1813

Re: Looking for a compact, rugged camera

how small is compact? how much is not expensive? what is considered good macro? ;) one option I would consider would be a used Panasonic GH4 with a 55mm AI Micro-Nikkor - if that is still considered compact. should be possible to find that for around 450EUR. not as tough as an action cam, but image ...
by chris_ma
Sun Oct 25, 2020 4:01 pm
Forum: Equipment Discussions
Topic: Thorlabs SM2 tubes flocking? (+ other question)
Replies: 7
Views: 2199

Re: Thorlabs SM2 tubes flocking? (+ other question)

if you want variable macro in the 0.2 to 0.7 range then a lens with native mount and focus mechanism is certainly more convenient then a thorlabs setup where you have to add spacer rings every time you want to change magnification. personally I'd just get a tripod collar slightly bigger and use a ru...
by chris_ma
Thu Oct 22, 2020 4:24 pm
Forum: Equipment Discussions
Topic: New Mitutoyo apo 10x
Replies: 48
Views: 7727

Re: New Mitutoyo apo 10x

funny things on ebay, the seller liujian81 [...] he has only one rating but currently offers 228.455 items :shock: yeah, stumbled over him as well. he's also listing a bunch of rayfact 2x lenses with images with a taobao watermark, so I guess he's a reseller that looks for items there and lists the...
by chris_ma
Sat Oct 17, 2020 1:37 pm
Forum: Equipment Discussions
Topic: Canon DSLR discounts
Replies: 9
Views: 2371

Re: Canon DSLR discounts

Thanks for the comment on the 'cancellation' of the AA filter in the 5DS-R - I thought it was removed, not some software attempt to counter it. I haven't double checked, but I would imagine it's cancelled optically by a second filter in front of the OLPF glas. at least that's how it's done in the D...