Search found 4726 matches

by Lou Jost
Thu Jan 21, 2021 9:14 pm
Forum: Equipment Discussions
Topic: New Lumix G9 vs used Canon 5DsR - what is better for extreme macro?
Replies: 6
Views: 258

Re: New Lumix G9 vs used Canon 5DsR - what is better for extreme macro?

I have used both FF and MFT systems, and I don't think it is realistic to rely on pixel-shifting to make up the difference in resolution between FF and MFT. The results of pixel shifting are excellent, but as others have stated above, it takes too long to use as a standard procedure, unless you only...
by Lou Jost
Thu Jan 21, 2021 8:27 am
Forum: Equipment Discussions
Topic: What even is this: Plan Apo 40x/1.0 W infinity f=180 unbranded m25 75mm long
Replies: 9
Views: 252

Re: What even is this: Plan Apo 40x/1.0 W infinity f=180 unbranded m25 75mm long

"Another water immersion objective with some weird housing: eBay item number:263140217445"
Does anyone know what WLSM means on that objective?
by Lou Jost
Wed Jan 20, 2021 7:40 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: 8000ED Image Circle
Replies: 2
Views: 165

Re: 8000ED Image Circle

Nice test! Many exotic lenses have bigger image circles than we typically use. We should really take advantage of that, like you are doing.
by Lou Jost
Sun Jan 17, 2021 11:26 am
Forum: Equipment Discussions
Topic: 50X objective recommendation
Replies: 31
Views: 1153

Re: 50X objective recommendation

I use several Nikon focusing blocks bought cheaply on eBay, and two of the three are excellent. The third was unacceptable but I could have returned it if I had lived in the US and been able to inspect it on delivery.
by Lou Jost
Fri Jan 15, 2021 5:53 pm
Forum: Equipment Discussions
Topic: 50X objective recommendation
Replies: 31
Views: 1153

Re: 50X objective recommendation

Wow - what kind of rail are you using to reach ~250 nm steps? That is closer to linear servo territory.
You can get step sizes almost that size with simple, cheap off-the-shelf microscope focusing block driven by the cheap WeMacro MicroMate.
by Lou Jost
Thu Jan 14, 2021 4:28 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Various Seed Pods
Replies: 6
Views: 266

Re: Various Seed Pods

I think black or white are safe choices, but I also think that other backgrounds are often interesting. But they only work if they are carefully chosen to nicely harmonize or contrast with the subject.
by Lou Jost
Thu Jan 14, 2021 10:56 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Various Seed Pods
Replies: 6
Views: 266

Re: Various Seed Pods

I very much agree with Kevin. The choice of background is almost as important as the choice of subject, and these textured industrial-green backgrounds are unpleasant to look at and distracting from the subjects. Diffusion would greatly improve your pictures. It is one of the most important things w...
by Lou Jost
Thu Jan 14, 2021 10:48 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Looking for advice to improve sharpness
Replies: 7
Views: 352

Re: Looking for advice to improve sharpness

One thing many forum members have noticed in the past is that those cone-shaped adapters can cause flare and should be flocked. Additional diffusion would also help, as you noted. But I suspect the main problem here is objective quality. There is no way anyone can make a good 10x 0.25 objective for ...
by Lou Jost
Mon Jan 11, 2021 4:06 pm
Forum: Equipment Discussions
Topic: Schneider-Kreutznach lens parameters
Replies: 5
Views: 253

Re: Schneider-Kreutznach lens parameters

Aha! Now the negative beta makes sense. The image is inverted.
by Lou Jost
Sun Jan 10, 2021 5:27 am
Forum: Equipment Discussions
Topic: Monochromatic Microscopes?
Replies: 21
Views: 882

Re: Monochromatic Microscopes?

I want one!!!! That depiction of the light path is crazy. I had no idea things had gotten that complex. projection optics with a numerical aperture (NA) of 0.33 I am a little surprised at the low NA. Some of my own visible-light photolithography lenses have larger NA. For example a 10x 0.38 for 436n...
by Lou Jost
Sat Jan 09, 2021 10:43 pm
Forum: Equipment Discussions
Topic: Monochromatic Microscopes?
Replies: 21
Views: 882

Re: Monochromatic Microscopes?

Such beautiful optical technology.
by Lou Jost
Sat Jan 09, 2021 11:56 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor-Pan system
Replies: 6
Views: 310

Re: Sensor-Pan system

Great to hear you have this working. I have been doing this as well, and there are some very easy ways to do this for those of us with more limited ambitions. Limited shift adapters exist for MFT, APS, and FF; of course one needs to use a lens with a larger image circle than the sensor size. These a...
by Lou Jost
Fri Jan 08, 2021 8:08 pm
Forum: Equipment Discussions
Topic: New 1.4x Lens Test Results Online
Replies: 27
Views: 931

Re: New 1.4x Lens Test Results Online

Thanks for the info on the 80mm lens, I will have to try mine at those magnifications. I look forward to learning about the QV microscope.