Hi guys I'm new here. I'm not a pro photog but I have
a serious question. I have seen Vivitar 135 telephotos
for sale. I found reference to Series1 lenses and they
seem to be odd f-sizes like 2.7 or something like that.
Then I find reference to normal f-size like 2.8. KEH has
a 2.8/135 lens for sale but it states WITH TX-MOUNT. Is
this like the Tamron where an adaptor is needed? Are all
Vivitar 2.8/135 lenses the same or did they make many
versions? Does a website explain all of this? Thanks.
Viktor
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