Originally posted by vonBaloney If used on film, the Vivitars should be fine. They are not soft wide-open, but of course they do improve stopped down, and film is much more forgiving in terms of fringing, etc. (Probably still seem some red/green in the bokeh if you look for it.) They were top-notch in the 70s compared to other similar (i.e. not fast) telephoto primes...
Of course there is fringing, due to lateral CA. This lens is clearly NOT aprochromatic
I have not tried this, in all honesty on digital, as it has a serious drawback, minimum focus is 7 meters(22feet for the metric impaired) and I tend to shoot small subjects today and need to get much closer than sanity would permit whit these guys
It is still sitting on my shelf however.