In article
>John Mostrom (jmostrom@adobe.com) wrote:
>: I'm interested in purchasing one of these long zooms for use with my
>: Nikon. Any opinions from owners of this lens?
>I had a SamYang 100-500 for a couple of days to evaluate. The lens is
>quite subject to flare (fogging), even from objects that are outside >the view through the viewfinder. I don't recommend it.
It may be hard to locate, but the Cosina 100-500mm impressed me
with its optical performance (and it is well-built) - and I'm
not easy to impress. The lens is excellent 100-400mm, with reduced
quality at 500mm. It appears to be slower than rating (f5.6-8),
and it is quite awkwardly large (though it takes a reasonable 72mm
filter size). I must admit that I rarely use it, because of its
size and speed, but it is a good lens.
Hope This Helps