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Sample gallery - Leica DG Vario-Elmar 100-400mm f/4-6.3 ASPH Power OIS
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11-30-2019, 09:02 AM
https://photozone.smugmug.com/Leica-DG-V...-Power-OIS
This one has been sitting on my desk for waayyy too long. I hate the thought of testing it. Not because of the lens but the focal length ...
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
11-30-2019, 10:25 AM
(11-30-2019, 09:05 AM)borisbg Wrote: You need it a lens to visit the zoo? Or airshows, or car races, or national parks. It's a specialized lens, of course - as are many others.
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji 
Would love to see the actual test of this one, Klaus.
 I have PL 100-400 for a year and a half and love it for what it is intended for: long reach in a very manageable package.
12-02-2019, 02:28 PM
f6.3 seems too slow for the long end to obtain optimal resolution but i probably said that years ago when it was announced. The oly which is 4.x fix aperture might be a better lens - i guess they need to come up with a new way to prevent diffraction of a small lens
You know adjust those laws of physics or something.
12-02-2019, 04:07 PM
(This post was last modified: 12-02-2019, 07:53 PM by Brightcolours.)
(12-02-2019, 02:28 PM)you2 Wrote: f6.3 seems too slow for the long end to obtain optimal resolution but i probably said that years ago when it was announced. The oly which is 4.x fix aperture might be a better lens - i guess they need to come up with a new way to prevent diffraction of a small lensWhat they can do is develop advanced deconvolution for their RAW converter, with detailed lens profiling for the lens. Then they could (mostly) undo what diffraction "lost". Canon offers such functionality in combination with DPP and Canon lenses and lens profiles. Here is an example, where the diffraction is known (lens profile, but in this example it is simulated diffraction): http://dougkerr.net//images/technical/di...on_02A.jpg In the middle is the original image. On the left is the simulated f32 diffraction image. On the right is the f32 deconvoluted image. I understand that this f32 is in FF terms, so f16 in MFTerms.
12-03-2019, 08:04 AM
Nice example. It makes me wonder how they do it.
Chief Editor - opticallimits.com
Doing all things Canon, MFT, Sony and Fuji
Results that can be obtained by image restoration methods are quite impressive. Please find below a couple of links that describe some deconvolution algorithms used to restore blurred images:
http://yuzhikov.com/articles/BlurredImag...ation1.htm https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4934271/ |
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