bobn2
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Posts: 71,955
Re: A new f/1.4 prime lineup instead
2
JaKing wrote:
If he had the right version (three different serial number ranges identifies which is which), he would not have this problem. I have version 1, and it's pretty ordinary compared to my "made in Japan" f/1.8 50, even at f/1.8.
Very possibly I found this review of it, which says 'At f/1.4 and f/2, border quality is uninspiring at best, but improves by f/2.8 and reaches maximum around f/5.6-f/8. Conclusion? Consistency is good and while performance around borders at wide apertures is dismal, overall performance can be considered pretty solid.'
Your friend's sounds like version 2, which is better than mine in both centre and corners, but not excellent wide open.
Another source says that the optical formula of v2 is exactly the same as v1. But I'm not sure that there is sufficient information in what I said about Iain's lens to say which it is. All I know is, he likes it.
Version 3 is sharp wide open in the centre and corners. I have a PDF file with all the serial numbers and version number optical characteristics somewhere, but don't think it is on my web site.
I think it's unlikely that it's sharp in the corners. It might be sharper than the other two, but it's still just a seven element double Gauss with no aspherics. Olympus, back in the days when they did design camera lenses, designed very good ones, but they couldn't perform magic. If they did have that magic back in the '60's and 70's, the question would be, why can't they apply it now and make us a compact f/1.4 normal which is sharp.
Still, the point being made, was that magic or no magic, the trade of small size for a bit of corner sharpness is still a good one for some, and one that we should have available.