I have one of these Lens that I have been thinking about selling. It is a Vivitar 650mm and with the 2x adapter it is 1300mm. It has the T42 mount so with the right adapter it will work on any brand camera mine has the Canon EOS mount.
This lens will make a nice photo if the sun is bright that is the thing that is not talked about. It like all of them is a 650mm @f8 so with the doublet on it becomes a 1300mm@f16 so you must have a sunny day.
I used this lens a few times but bought a Canon L series 600mm F4 I have not used the Vivitar since.
But there is a $10.000.00 difference in price. :shock:
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