Gary Schloss writes from the land of forgetfulness:
<< Angel Lobo wrote:
>Gary,
>Why is the Vivitar One touch version more convenient for Oly users ?
Because it takes 55mm filters which are a standard filter size for
Zuiko lenses. 52mm is not standard.
>Can somebody explain some diferences (optical quality) Viv. 70-150 One
>touch vs Two touch ?
I believe the two versions are quite similar optically, even though
they were made by different manufacturers. AFAIK, the 2-touch version
has close-focus (macro) capability, while the 1-touch version does not.
Cheers,
/Gary Schloss. >>
Guys and Gals, I will attempt to clear up Gary's mini-alzheimers attack
regarding these lenses. First, the filter size: Both versions of the Vivitar
70-150 have a 52mm filter thread. Second, the close-focus (macro) capability:
The 2-touch Vivitar has a close-focus range built into the rotating zoom
control at the 70mm end, and will give you a seven inch full-frame subject at
approximately 16-18 inches. The one-touch Vivitar, (probably made by Kiron),
gives a "macro" spot on the focusing ring, and is available at all focal
lengths in the range 70-150mm. At 150mm the "macro" spot gives you a six inch
full-frame subject at approximately 30-32 inches.
My personal preference of the two is the one-touch as it will give a slightly
larger image at it's closest focusing distance, and I prefer the push-pull
zoom with focusing on one ring.
Optical quality of either one is good enough for me as I rarely enlarge over
8x10, and I can not tell the difference. I also have a Kiron 70-150 one-touch
in a Pentax mount, and it is almost identical to the one-touch Vivitar, (also
52mm filter thread).
OK Gary, back to the gaming tables now. ;-) ;-)
Regards, Paul Connet
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