Search found 954 matches
- Wed Feb 07, 2024 5:01 am
- Forum: Equipment Discussions
- Topic: Focus again with the Canon MP-E 65mm
- Replies: 61
- Views: 1609
Re: Focus again with the Canon MP-E 65mm
Right now I'm undecided between the Castel-L and the Sewbo LS001. The price is close. The performance should be similar?! Will Swebo be more accurate? Is that clamp tightening knob facing forward along the rail practical to adjust? If I am missing any important aspect, please tell me. I am receptiv...
- Mon Feb 05, 2024 4:01 am
- Forum: Equipment Discussions
- Topic: Tell me how you can cover the magnification range from 6x to 8x?
- Replies: 45
- Views: 1448
Re: Tell me how you can cover the magnification range from 6x to 8x?
The option with Mitutoyo 10x or a Chinese equivalent + a 200 mm telephoto lens is not suitable for a crop sensor due to vignetting, that is, the maximum you can lower the magnification without vignetting is up to approximately 8.7x. Why pushing down on a crop sensor? You could get a used full frame...
- Fri Jan 19, 2024 11:36 am
- Forum: Equipment Discussions
- Topic: Macro rail assembly
- Replies: 39
- Views: 2280
Re: Macro rail assembly
in vertical orientation the M(A) seems to be the most important force to consider, which is 31 Newton meter for the KR20. Assuming the camera, bellows and lens weigh 5,5kg, that's roughly 54 newton, even at the fastest speed it's moving barely 1mm/s - so that's what, like 0,054 Nm? But the center o...
- Wed Jan 10, 2024 1:37 am
- Forum: Beginners Micro
- Topic: Down the rabbit hole… and some questions
- Replies: 10
- Views: 889
Re: Down the rabbit hole… and some questions
And the dust, oh yes. It is indeed a surprise how much dust accumulates - every time :roll: . This is especially true for the glass chips. I usually use a quite harsh lighting to emphasize the corners and to get a "technical" look (some kind of low key photography). Hello Matthias, nice to see fell...
- Tue Jan 09, 2024 9:53 am
- Forum: Equipment Discussions
- Topic: Macro rail assembly
- Replies: 39
- Views: 2280
Re: Macro rail assembly
Is the motor the same as the one sold on Aliexpress or is it different? there are millions off different vendors on Aliexpress, so what can I say? My motor is nothing special, you can get such motors on Aliexpress/ebay. Got for a stronger (bigger) model what your driver can handle (see in the curre...
- Tue Jan 09, 2024 9:40 am
- Forum: Equipment Discussions
- Topic: Macro rail assembly
- Replies: 39
- Views: 2280
Re: Macro rail assembly
I probably don't understand something, please explain. The motor has 400 steps of 0.9 degrees. It turns out that each step is 2.5 microns. And the manufacturer on the website https://www.mjkzz.de claims a pitch of less than 1 micron. How does this happen? It seems like the engine can’t take smaller...
- Tue Jan 09, 2024 3:41 am
- Forum: Equipment Discussions
- Topic: Macro rail assembly
- Replies: 39
- Views: 2280
Re: Macro rail assembly
probably it works as well as the THK. What helps you most is to get a version with two blocks and spindle with a a small pitch of 1 or 2mm. In order to have sufficient stroke length get a longer rail, let's say 300mm. I run a vertical THK KR2602B rail with 2mm pitch spindle together with a 400 step ...
- Sun Jan 07, 2024 4:36 am
- Forum: Equipment Discussions
- Topic: Lasertec 5x 0.25 HR Objective on eBay
- Replies: 42
- Views: 6016
Re: Lasertec 5x 0.25 HR Objective on eBay
Once I get this test done, still have to do some in-the-field images and a bokeh test, then I will move to other 90mm lenses like Tamron, Sigma, then 105mm lenses, Tamron, Sigma, Canon, Nikon etc, than 180mm. I'm actually looking forward to using some old glass, some of these I've owned before! Thi...
- Sat Dec 30, 2023 3:31 am
- Forum: Equipment Discussions
- Topic: 2.8x 50mm Lens Test Finally Online
- Replies: 13
- Views: 1090
Re: 2.8x 50mm Lens Test Finally Online
Hello Robert, thanks for another exzellent review, very appreciated. How would you rate the Laowa 2.5-5x @2.8 compared to the bunch of lenses. On my copy I found it outresolves the A7R4/5 because pixelshift captures show much more image detail. All the best in 2024 I hope you will keep up your work ...
- Sat Dec 23, 2023 4:18 pm
- Forum: Equipment Exchange
- Topic: Idler Rails and Assemblies
- Replies: 12
- Views: 3836
Re: Idler Rails and Assemblies
get a THK type "B" rail with integrated idler like the THK KR2602B
- Wed Dec 20, 2023 2:30 pm
- Forum: Equipment Discussions
- Topic: Nikon TU Plan APO 50x/0.80 epi objective - 1st light
- Replies: 4
- Views: 1845
Re: Nikon TU Plan APO 50x/0.80 epi objective - 1st light
For this test, I shot a 100-image stack using 1 micron spacing. Lighting was two Trond flat-panel LED lamps close to and pointed in the general direction of the specimen (a piece of butterfly wing). I used 4-shot pixel shift mode and converted each group of four images to true-colour using Sony Ima...
- Wed Dec 20, 2023 2:27 pm
- Forum: Equipment Discussions
- Topic: who has the new Laowa 90mm/2,8 2:1 Macro?
- Replies: 39
- Views: 11640
- Wed Dec 20, 2023 5:06 am
- Forum: Equipment Discussions
- Topic: Zeiss GF Planachromat / GF Planapochromat
- Replies: 13
- Views: 3999
- Wed Dec 20, 2023 2:58 am
- Forum: Equipment Discussions
- Topic: Zeiss GF Planachromat / GF Planapochromat
- Replies: 13
- Views: 3999
Re: Zeiss GF Planachromat / GF Planapochromat
I'm observing this one, CARL ZEISS JENA Planachromat LDN GF 40x / 0,60 oo / 1.2-A:
https://www.ebay.de/itm/194307220899
the LDN seems to be one of the latest development made under Zeiss Jena. You can take off the coverslip thickness dial and have even more WD.
But I'm too scary to invest
https://www.ebay.de/itm/194307220899
the LDN seems to be one of the latest development made under Zeiss Jena. You can take off the coverslip thickness dial and have even more WD.
But I'm too scary to invest
- Sun Dec 17, 2023 3:11 pm
- Forum: Equipment Discussions
- Topic: Poltergeist in my basement
- Replies: 61
- Views: 27813
Re: Poltergeist in my basement
Edit: I will get some pieces of polycarbonate, which has good thermal expansion resistance to make brackets for the wings and screw them on the positioning stage. The ones I currently use are not very reliable... Are you sure? Thermal expansion coefficient of polycarbonate is three time higher than...