Vivitar or Tokina
A lot of lesser marque 300mm and 400mm lenses were of rather inferior quality though, and without seeing pictures taken with these lenses I would steer clear.
G
Not really a birding lens, but possibly OK for sports etc. at f/8 and high ISO. Bit difficult to hold steady.
Pentax K-1 + K-5 and some other stuff
Algi
Shooting the Welsh Wilderness with K-m, KX, MX, ME Super and assorted lenses.
I am in work at the moment so I don't have the link but if you search for 'vivitar serial numbers' there is a site that details who made the lense for Vivitar according to the serial number - some are better than others so it's best that you check.
Regards
Stu.
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142 posts
13 years
ayrshire