03-20-2012, 04:07 PM
[quote name='Brightcolours' timestamp='1332234080' post='16887']
So still I have not seen anywhere how thick the sensor filter glass is for the 5N. Must be a LOT thinner then. How is its AA-filter in comparison?
[/quote]
I believe that it is a combination of all this.
Frankly, considering all this I am, by now, starting to wonder why this worked out so well ... so far.
NEX has a flange distance of just 18mm.
e.g. The Sony 16mm f/2.8 has a rear element with a diameter of about 1cm and the element is positioned close to the mount (it's a pancake after all).
An obvious conclusion is, for instance, that this lens isn't tele-centric at all because it would either require a much bigger rear element or, alternatively, at least keep a much bigger distance for this - after all it must project to an image circle with a much bigger diameter (ca. 2.75cm).
Now if it is no tele-centric design it is actually more related to the "legacy" Leica M stuff rather than a "modern" design - which was the story that I hinted to before.
Fuji has the same "problem" (flange distance: 1.7cm).
MFT has 2cm, NX has 2.55cm just to mention.
Based on what we've seen so far 2cm for MFT is probably Ok because the image circle has a much smaller diameter (ca. 2.15cm).
See also:
http://www.opto-engineering.com/telecent...orial.html
So still I have not seen anywhere how thick the sensor filter glass is for the 5N. Must be a LOT thinner then. How is its AA-filter in comparison?
[/quote]
I believe that it is a combination of all this.
Frankly, considering all this I am, by now, starting to wonder why this worked out so well ... so far.
NEX has a flange distance of just 18mm.
e.g. The Sony 16mm f/2.8 has a rear element with a diameter of about 1cm and the element is positioned close to the mount (it's a pancake after all).
An obvious conclusion is, for instance, that this lens isn't tele-centric at all because it would either require a much bigger rear element or, alternatively, at least keep a much bigger distance for this - after all it must project to an image circle with a much bigger diameter (ca. 2.75cm).
Now if it is no tele-centric design it is actually more related to the "legacy" Leica M stuff rather than a "modern" design - which was the story that I hinted to before.
Fuji has the same "problem" (flange distance: 1.7cm).
MFT has 2cm, NX has 2.55cm just to mention.
Based on what we've seen so far 2cm for MFT is probably Ok because the image circle has a much smaller diameter (ca. 2.15cm).
See also:
http://www.opto-engineering.com/telecent...orial.html