Search found 5984 matches
- Sat Mar 16, 2024 7:34 am
- Forum: Equipment Discussions
- Topic: Lens recomendation for film reproduction
- Replies: 69
- Views: 1753
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.
- 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: 324
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...
- Tue Mar 12, 2024 2:39 pm
- Forum: Equipment Discussions
- Topic: EL Nikkor+Fujifilm GFX
- Replies: 44
- Views: 991
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 ...
- 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: 817
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...
- Mon Mar 11, 2024 5:33 pm
- Forum: Equipment Discussions
- Topic: EL Nikkor+Fujifilm GFX
- Replies: 44
- Views: 991
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...
- 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: 817
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 ...
- Sun Mar 10, 2024 8:44 am
- Forum: Photography Through the Microscope
- Topic: Images from an Auliscus ralfsianus diatom slide using 450nm light
- Replies: 5
- Views: 358
Re: Images from an Auliscus ralfsianus diatom slide using 450nm light
Wonderful! I like the dimensionality of it.
- 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: 817
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...
- 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: 817
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 (...
- 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: 817
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...
- 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: 817
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...
- 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: 2142
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...
- Tue Mar 05, 2024 4:46 pm
- Forum: Macro & Microscopy Articles
- Topic: Why and how are insects attracted to night lights
- Replies: 5
- Views: 402
Re: Why and how are insects attracted to night lights
I hadn't realized there were pelagic fishing bats. Very cool. We had big fishing bats in freshwater Amazonian lakes. Amazing how they could catch fish in the dark.
- Tue Mar 05, 2024 7:37 am
- Forum: Equipment Exchange
- Topic: SOLD: Zeiss DIC/Phase/Fluorescence microscope
- Replies: 5
- Views: 767
Re: Zeiss DIC/Phase/Fluorescence microscope
I've never seen such a complete and extensive offering, ever!
- Tue Mar 05, 2024 7:34 am
- Forum: Equipment Discussions
- Topic: Mitutoyo 10x 0.42 M Plan APO HR lens adventure
- Replies: 19
- Views: 922
Re: Mitutoyo 10x 0.42 M Plan APO HR lens adventure
Very sad Robert. As you know, this happens a lot, and not just on eBay. B&H Photo used to do an exemplary job of packing when I was starting out in photography, but over the last ten years their packing has been criminal. Often a single shoot of bubble wrap only large enough to protect one side of t...