Search found 5927 matches

by Lou Jost
Sun Mar 17, 2024 4:04 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Rio Bigal Reserve: Ecuador
Replies: 6
Views: 116

Re: Rio Bigal Reserve: Ecuador

Beautiful pictures, and it is good to see you posting again! Any idea of the species of Pristimantis being eaten by the tarantula?
by Lou Jost
Sat Mar 16, 2024 4:25 pm
Forum: Equipment Discussions
Topic: Is the era of Nikon 10x CF 0.3NA / 20x 0.46NA not-so-great for APSC? Also curious about 100x 0.95 or other high-na?
Replies: 4
Views: 174

Re: Is the era of Nikon 10x CF 0.3NA / 20x 0.46NA not-so-great for APSC? Also curious about 100x 0.95 or other high-na?

Havent read it all yet but these nikon CF infinity objectives were paired with eyepieces with a field number up to 26.5mm so aps-c is barely out of their nominal spec. Even though the cfi60 line has taken over as Nikon's main system some of these 45mm infinity cf objectives are actually still made ...
by Lou Jost
Sat Mar 16, 2024 4:21 pm
Forum: Equipment Discussions
Topic: MEJIRO GENOSSEN FL0530 4.0/110 FLOAT LENS TEST IS FINALLY ONLINE
Replies: 63
Views: 3115

Re: MEJIRO GENOSSEN FL0530 4.0/110 FLOAT LENS TEST IS FINALLY ONLINE

You can always use a real view camera with your lens and camera. Far greater freedom for everything: big tilts, huge shifts, gigantic extensions if needed.
by Lou Jost
Sat Mar 16, 2024 7:34 am
Forum: Equipment Discussions
Topic: Lens recomendation for film reproduction
Replies: 16
Views: 312

Re: Lens recomendation for film reproduction

The Sigma Art macro lenses are excellent choices, but on a cropped sensor do not stop them down to 5.6. F/4 is close to their sharpest aperture. And use the highest resolution you can (unless you have strong practical, non-optical reasons for limiting the file sizes). You WILL lose detail otherwise.
by Lou Jost
Sat Mar 16, 2024 7:26 am
Forum: Equipment Discussions
Topic: 3d printed filter ring laowa 25mm, can print for free, can also print other simple, small things for free
Replies: 8
Views: 179

Re: 3d printed filter ring laowa 25mm, can print for free, can also print other simple, small things for free

That's pretty good but my epoxy solution gives more working distance and a much smaller diameter so that the rim of the filter holder does not hit parts of the subject (which is a big issue for me with my subjects). I now use a 37mm polarizer and the system is extremely compact. I'm not home right n...
by Lou Jost
Tue Mar 12, 2024 2:39 pm
Forum: Equipment Discussions
Topic: EL Nikkor+Fujifilm GFX
Replies: 22
Views: 468

Re: EL Nikkor+Fujifilm GFX

I think you still haven't said how you want to use the lens. That's really important to know. Many enlarger lenses are not great at infinity. I tested many of them at infinity and I was usually disappointed. There were a few acceptable ones though. Even these usually required considerable stopping ...
by Lou Jost
Mon Mar 11, 2024 5:44 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor size and depth of field
Replies: 24
Views: 630

Re: Sensor size and depth of field

But isn't binning just averaging four pixels together? (That's the way my monochrome cameras implement binning.) If so, you are showing that noise from individual small pixels averages out when they are combined. I suspect that your method of reducing the resolution of the individual pixels (in the...
by Lou Jost
Mon Mar 11, 2024 5:33 pm
Forum: Equipment Discussions
Topic: EL Nikkor+Fujifilm GFX
Replies: 22
Views: 468

Re: EL Nikkor+Fujifilm GFX

I think you still haven't said how you want to use the lens. That's really important to know. Many enlarger lenses are not great at infinity. I tested many of them at infinity and I was usually disappointed. There were a few acceptable ones though. Even these usually required considerable stopping d...
by Lou Jost
Mon Mar 11, 2024 10:15 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor size and depth of field
Replies: 24
Views: 630

Re: Sensor size and depth of field

But isn't binning just averaging four pixels together? (That's the way my monochrome cameras implement binning.) If so, you are showing that noise from individual small pixels averages out when they are combined. I suspect that your method of reducing the resolution of the individual pixels (in the ...
by Lou Jost
Fri Mar 08, 2024 10:15 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor size and depth of field
Replies: 24
Views: 630

Re: Sensor size and depth of field

"To me the Sensor+ image is much cleaner and more homogenous, far fewer yellow spots/patches and the edges were much better - that and the increased dynamic range were pretty good reasons so use it at/beyond ISO400. And as I said, no noise reduction is applied." But this supports my main point: fou...
by Lou Jost
Fri Mar 08, 2024 2:05 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor size and depth of field
Replies: 24
Views: 630

Re: Sensor size and depth of field

... EDIT: for me the most striking examples were the hardware-based pixel binning CCD sensors made by DALSA. There was a clear difference in noise profile and dynamic range between the "full res" images and the ones made using pixel binning, even when comparing both at the same (lower) resolution (...
by Lou Jost
Fri Mar 08, 2024 10:32 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor size and depth of field
Replies: 24
Views: 630

Re: Sensor size and depth of field

"For me it's very difficult to avoid talking about diffraction without mentioning pixel size" I have the opposite perspective. Smaller pixel size does nothing to increase the effect of diffraction on the final displayed image, if camera settings, degree of final enlargement, and viewing distance ar...
by Lou Jost
Fri Mar 08, 2024 6:33 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor size and depth of field
Replies: 24
Views: 630

Re: Sensor size and depth of field

"For me it's very difficult to avoid talking about diffraction without mentioning pixel size" I have the opposite perspective. Smaller pixel size does nothing to increase the effect of diffraction on the final displayed image, if camera settings, degree of final enlargement, and viewing distance ar...
by Lou Jost
Wed Mar 06, 2024 3:43 pm
Forum: Equipment Discussions
Topic: AstrHori 25mm f/2.8 2x-5x full-frame macro lens
Replies: 52
Views: 1735

Re: AstrHori 25mm f/2.8 2x-5x full-frame macro lens

I've been doing some tests of my own copy of the Laowa 2.5x-5x on full frame using a B+W test wafer. In general they confirm what Lothman found. At 5x, the lens really is sharpest at f/2.8, fully open. This is an amazing feat for any lens. However there is some dark purple lateral CA at this apertur...