Search found 231 matches

by chris_ma
Sun Aug 02, 2020 1:50 pm
Forum: Equipment Discussions
Topic: Schneider macro varon 85/4.5 CAS @1x
Replies: 10
Views: 477

Re: Schneider macro varon 85/4.5 CAS @1x

not sure why the overall contrast gets so much lower when stopping down though, any ideas? I think one of the reasons may be related to the electronic shutter. I used an LED board as the light source and used the electronic shutter to shoot, which may conflict with the frequency of the LED (you can...
by chris_ma
Sun Aug 02, 2020 1:44 pm
Forum: Equipment Discussions
Topic: Q: RAM and SSD PC upgrade for Photoshop stacking
Replies: 11
Views: 311

Re: Q: RAM and SSD PC upgrade for Photoshop stacking

In my experience from other process intensive tasks, RAM speed (and matching RAM modules) is not that critical. It‘s nice to have and you might gain a few percent speed increase, but it‘s not worth spending a lot of money on. Having enough RAM can be really important and speed up things significantl...
by chris_ma
Tue Jul 28, 2020 9:59 am
Forum: Equipment Discussions
Topic: Schneider macro varon 85/4.5 CAS @1x
Replies: 10
Views: 477

Re: Schneider macro varon 85/4.5 CAS @1x

great images, and it seems that it's diffraction limited even on the small pixel pitch of the GFX100.

not sure why the overall contrast gets so much lower when stopping down though, any ideas?
by chris_ma
Mon Jul 27, 2020 11:13 am
Forum: Equipment Discussions
Topic: How to increase the performance of Lightroom?
Replies: 9
Views: 257

Re: How to increase the performance of Lightroom?

seems like you already tested the important parts. unfortunately I don't have LR6 installed anymore to test, but here an article from 2018 about the speed improvements from 6 to CC Classic: https://photographylife.com/lightroom-6-vs-cc-7-1-vs-7-2-performance-comparison so about 72% speedup on a desk...
by chris_ma
Mon Jul 27, 2020 7:55 am
Forum: Equipment Discussions
Topic: How to increase the performance of Lightroom?
Replies: 9
Views: 257

Re: How to increase the performance of Lightroom?

Lightroom unfortunately often has performance problems - new versions should be slightly better but still not fast. on the upside, the debayering is one of the best I've seen so far. some idea (most of which you already tried already): - Get a really fast SSD, ie one with fast controller and interfa...
by chris_ma
Sat Jul 18, 2020 9:08 am
Forum: Equipment Discussions
Topic: linos lens 105mm F 5.6 need help
Replies: 7
Views: 344

Re: linos lens 105mm F 5.6 need help

I‘m also using 43mm step up adapters, works pretty well.
by chris_ma
Fri Jul 10, 2020 3:37 am
Forum: Equipment Discussions
Topic: The Canon R5
Replies: 5
Views: 388

Re: The Canon R5

Canon has made a nice presentation about what changes they've made from Canon R to r5 and r6. It is in 2 parts but only the first seems to be available now: https://downloads.canon.com/nw/camera/products/eos/product-1/pdfs/EOS-R5-improvements-part-1.pdf interestingly they also mention focus bracket...
by chris_ma
Tue Jul 07, 2020 9:08 am
Forum: Equipment Discussions
Topic: Recommendations for linear stage for use with 10x objective
Replies: 18
Views: 641

Re: Recommendations for linear stage for use with 10x objective

OK but you should tell that you are talking of a used KR2001A, in new I assume it is several times as expencive. I looked at the THK price list a year ago and the KR20 series was around 900 USD if I recall correctly. The OP is looking for a positioning system though, the THK is prolly overkill for ...
by chris_ma
Sat Jul 04, 2020 11:12 pm
Forum: Equipment Discussions
Topic: Need advice for 10X microscope objective
Replies: 22
Views: 3139

Re: Need advice for 10X microscope objective

Lou Jost wrote:
Sat Jul 04, 2020 7:08 pm
. I prefer my vertical set-up, but for butterfly wings lying flat, dust can be a problem. So you may like to use a horizontal set-up for them.
I‘m using a philips air cleaner with hepa filter before the photo session, reduces the dust floating around quite a bit.
by chris_ma
Sun Jun 28, 2020 9:49 am
Forum: Equipment Discussions
Topic: Anatomy of a liquid CPU cooler
Replies: 14
Views: 4517

Re: cooling stage

I just have to dig this out. Since I have a new macro rig (around a thorlabs 66mm rail) with high stability and room for a cooling stage, I am thinking of a source for cooling. Did this CPU liquid cooler work? Any problems with vibrations due to the pump directly mounted on the cooler? Hi, the liqu...
by chris_ma
Sun Jun 28, 2020 8:59 am
Forum: Equipment Discussions
Topic: US Buyers Beware of Tariffs on EU Products
Replies: 20
Views: 776

Re: US Buyers Beware of Tariffs on EU Products

in addition (to taxes that had been paid already in South Korea ) I agree that it hurts (it's the same here in germany), but to clarify the above: On new items, very likely no taxes have been paid in south korea if it's an export sale, so the item will only be taxed once. At least in germany, if co...
by chris_ma
Sat Jun 20, 2020 11:48 pm
Forum: Equipment Discussions
Topic: Linos inspec.x L 5.6/105 Line Scan Lens Test at 0.3x and 3x
Replies: 7
Views: 667

Re: Linos inspec.x L 5.6/105 Line Scan Lens Test at 0.3x and 3x

Great to see a comparison, I had this lens for a couple of months but never got around to put really use it so far. One aspect where the inspec.x clearly exceeds the Sigma is distortion. Even on APS the Sigma shows quite a bit of change while the Linos remains very constant. The cosina seems to cope...
by chris_ma
Sat Jun 20, 2020 11:55 am
Forum: Equipment Discussions
Topic: What could be the cause of this?
Replies: 16
Views: 1124

To me the periodicity suggests moire Yeah this is the same suggestion as what a friend of mine in photonics claims. "Camera probably tried to algorithmically fix moire, which backfired because Nikon (implying that Nikon's software can be funky)". yeah, that sounds like the most probably explanation...
by chris_ma
Fri Jun 19, 2020 7:33 am
Forum: Equipment Discussions
Topic: What could be the cause of this?
Replies: 16
Views: 1124

hmm, interesting...

could be a result of some in camera RAW preprocessing, like if they had to map out some dead pixels (too many pixels for that, but something similar)

or it's simply a bug in the camera.
by chris_ma
Thu Jun 18, 2020 11:47 am
Forum: Equipment Discussions
Topic: What could be the cause of this?
Replies: 16
Views: 1124

does this happen with both, jpeg and RAW files?
and in different RAW processors?