Search found 108 matches
- Tue Mar 24, 2020 4:33 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Sample density needed to resolve Rayleigh features
- Replies: 40
- Views: 12165
To tie up the loose end concerning sampling vs. binning, I found a relevant article: http://personal.sron.nl/~jellep/spex/manual/manualse95.html . The sampling theorem does apply to binning also. If the original image is bandwidth limited, then the original image can be reconstructed from the bin i...
- Tue Mar 24, 2020 4:01 pm
- Forum: Equipment Discussions
- Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
- Replies: 264
- Views: 54623
Thanks, I saw his review(s)... Not super strong. Maybe I'll just look for a 2x objective... The working distance of this one is huuuge! The laws of physics dictate that there must be a compromise somewhere to compensate for this advantage. Anyway, as I said, the quality is not too bad. But again, a...
- Tue Mar 24, 2020 1:05 pm
- Forum: Equipment Discussions
- Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
- Replies: 264
- Views: 54623
Have you had a chance to shoot with it/ Would you post some pix when you have time? And if you know where I can find the story about what was modified, could you point me to a link? Thanks very much. I didn't shoot much with it, except for the test posted above on Feb 15. It looks like the front el...
- Tue Mar 24, 2020 12:31 pm
- Forum: Equipment Discussions
- Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
- Replies: 264
- Views: 54623
Taking this back to the top, it appears that the modified Mitakon Creator 85mm f/2.8 1-5X Super Macro is not yet shipping. Has there been any announcement about when it is expected? In the meantime, does anyone know of another lens that covers the 1x - 2.5x range? Thanks for any info. I got mine sh...
- Sun Mar 22, 2020 2:15 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Sample density needed to resolve Rayleigh features
- Replies: 40
- Views: 12165
when we only transmit 1 bit of information, meaning only pure white or pure black. In a photographic system, one pixel is not one bit of information. Values in between also convey real information. In most monochrome cameras there are 256 meaningful levels for each pixel. So eight bits of informati...
- Sun Mar 22, 2020 12:59 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Sample density needed to resolve Rayleigh features
- Replies: 40
- Views: 12165
When I said " In our discussions here " I'm referring to an image captured on a pixel. Pixels simply record number of photons captured in a given exposure period with a given efficiency. So my understanding is an image capture on a pixel, a blacker subject represents a lack of photons and a whiter ...
- Sun Mar 22, 2020 8:57 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Sample density needed to resolve Rayleigh features
- Replies: 40
- Views: 12165
In our discussions here I would think black as a lack of photons, as pure black as no detectable photons. Not necessarily. Any levels of energy are OK as long as the receiver can differentiate them and knows the encoding/modulation rule used by the transmitter. Moreover, it can even be the other wa...
- Sat Mar 21, 2020 8:59 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Sample density needed to resolve Rayleigh features
- Replies: 40
- Views: 12165
A certain amount of information destined to a specific pixel is scattered over its neighboring pixels What I am having trouble with is the use of "information" where most physicists would say "energy". The energy in itself is not information, but it can carry information. Usually, the information i...
- Sat Mar 21, 2020 8:08 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Sample density needed to resolve Rayleigh features
- Replies: 40
- Views: 12165
We must be talking about different time scales. That photon is indeed random, and its trajectory cannot be reconstructed. If you have lots of photons and average them, then yes, you can reconstruct the source. If that's what you meant, I am with you. Yes, while the behavior of individual photons is...
- Sat Mar 21, 2020 7:41 pm
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Sample density needed to resolve Rayleigh features
- Replies: 40
- Views: 12165
...diffraction is routinely interpreted as a loss even though underlying issue is that the information is present but got redistributed in a way which both makes it cumbersome to access and impedes the use of other information. Can you explain that or give a reference? Information is not the same t...
- Tue Mar 10, 2020 11:00 am
- Forum: Macro and Micro Technique and Technical Discussions
- Topic: Sample density needed to resolve Rayleigh features
- Replies: 40
- Views: 12165
In communications (where these theorems originated) recent work has been pushing the limits beyond Nyquist. Most have thought of Nyquist as a limit, but as far back as 1975 Mazo at Bell Labs had shown it is not an absolute limit barrier, but could be "broken" in fact under certain signaling conditi...
- Thu Mar 05, 2020 6:42 am
- Forum: Equipment Discussions
- Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
- Replies: 264
- Views: 54623
This is great, it also saves me from more testing as it would be useless to test something that is SO different from public version. One observation: the above photo was made with Canon 5D mk3 and, in my calculations, I used 35mm for the sensor size. However, I later noticed that, the sensor width ...
- Sun Mar 01, 2020 1:22 pm
- Forum: Equipment Discussions
- Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
- Replies: 264
- Views: 54623
with extended holidays, finally got some time to do some work. But today a big BUG caught me, spent 2 hours debugging it, it turns out at 1:1 with Zhongyi Super Macro Mk II, magnification is NOT 1:1, it is 1.16:1, or 1.16x. I thought I had some bug in my software and it is "good" for others to be a...
- Tue Feb 25, 2020 2:25 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: General Plus Silicon Chip panorama
- Replies: 5
- Views: 2022
I only have a 4000x4000 version here:Bob-O-Rama wrote:Ultima,
Do you have the full image hosted somewhere?
https://i.postimg.cc/CMxH7w8y/Wafer-1.jpg
The original was larger.
- Mon Feb 24, 2020 2:41 pm
- Forum: Technical and Studio Photography -- Macro and Close-up
- Topic: General Plus Silicon Chip panorama
- Replies: 5
- Views: 2022