Bobu
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Lotusm50 wrote:
Mike K wrote:
Boris,
Judging by your original FF image, these crops represent the last 20% of the frame heading into the extreme corner? Thus the gradation of sharpness represent softness in the last 10% of the extreme corner. This is a pretty small fraction of the frame, as even the edge of the frame horizontal to the center should be pretty
Yes, quite small fraction of the frame. This is much ado about very, very little, IMHO. This is the least seen, least used, and often cropped 1% (or less) of the frame. As mentioned before, nearly ALL 50mm standard lens exhibit this, why this particular 50mm should be called to task for it is mind boggling.
Comparing it to a 100mm lens is useless. If you need a 100mm lens use a 100mm lens, if you need a 50mm use a 50mm. The 50mm MP is incomparable across 99% of the frame and merely comparable to all other 50mm's over the last tiny fragment of the frame. To dismiss the lens for this is a kin to throwing the baby out with the bath water. Even if the 35-70 might be a touch better in the absolute corner than the 50 MP, the performance of the 50 MP over 99+% of the frame totally and obviously dominates the old zoom. Would you really prefer to use the 35-70 over the 50MP?! I still don't get the point of all this. It's not perfect? No lens is. That is to be expected. So far we've seen nothing that isn't shown in the published MTF's. IMHO, you spent a lot of time and effort obsessing over this for very little insight or gain. If you don't want to use it because of this, that is your prerogative, but you would be leaving a lot of performance on the table that you can't get in another 50mm lens -- performance in areas of the frame that matter a great deal more than the often-unseen absolute corner. Use the lens for real photographs rather that brick walls and fences and it will never fail to impress.
I have the feeling, that you don't really read my posts. Or maybe you just don't understand it.
I said, that i liked the 50MP and will keep the lens. It will probaby substitute my 35-70. But before I make such a decision, I do some tests. Sharpness is best tested on a flat wall. I don't understand your problem with this approach.
And your assumption, that nearly all lenses look like this, is completely wrong. The 50MP is the only lens, that shows this behaviour. No other lens, I own, shows this. And you can't tell me, that it is the most difficult task in the world to develop a 50mm lens with sharp corners.
Boris
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