The 2X -A is made for the 100/2.8, both 135's , 200/4 and the 100-200 zoom.
I own one of these and have used it with the lenses it is designed for and
with other lenses. You give up two f stops nad some sharpness. Tom can
probably give you a better read on prices but I think you will probably find
them selling for 160-200 on ebay. You might do a search on ebay for
completed auctions to see if any have sold recently. I saw one LNIB at a
local store (Houston,TX) and they wanted a huge price (over $300).This will
make your 135 a 270mm. You might also look at the Vivitar Macro focusing
teleconverter. It is a nice unit that many list members have had good
results with. Be sure it is the macro focusing unit which has been selling
around $50 on ebay for a nice clean one. Bill Barber
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