Search found 108 matches

by Ultima_Gaina
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: 5474

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...
by Ultima_Gaina
Tue Mar 24, 2020 4:01 pm
Forum: Equipment Discussions
Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
Replies: 264
Views: 37355

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...
by Ultima_Gaina
Tue Mar 24, 2020 1:05 pm
Forum: Equipment Discussions
Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
Replies: 264
Views: 37355

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...
by Ultima_Gaina
Tue Mar 24, 2020 12:31 pm
Forum: Equipment Discussions
Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
Replies: 264
Views: 37355

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...
by Ultima_Gaina
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: 5474

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...
by Ultima_Gaina
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: 5474

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 ...
by Ultima_Gaina
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: 5474

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...
by Ultima_Gaina
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: 5474

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...
by Ultima_Gaina
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: 5474

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...
by Ultima_Gaina
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: 5474

...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...
by Ultima_Gaina
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: 5474

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...
by Ultima_Gaina
Thu Mar 05, 2020 6:42 am
Forum: Equipment Discussions
Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
Replies: 264
Views: 37355

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 ...
by Ultima_Gaina
Sun Mar 01, 2020 1:22 pm
Forum: Equipment Discussions
Topic: Zhongyi (Mitakon) Super Macro Lens (1 - 5x)
Replies: 264
Views: 37355

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...
by Ultima_Gaina
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: 1338

Bob-O-Rama wrote:Ultima,

Do you have the full image hosted somewhere?
I only have a 4000x4000 version here:
https://i.postimg.cc/CMxH7w8y/Wafer-1.jpg

The original was larger.
by Ultima_Gaina
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: 1338

Here is my silicon wafer 6 shots panorama (size 3.2mm):

Image

Nikon CFI Plan Fluor 10x/0.30