>At 12:08 AM 10/9/98 -0400, Mark wrote:
>Hmm.... Good point. I am actually interested in using this lense to
>photograph aircraft demonstrations. Especially at airshows... The 85-250
>might not be suitable for this. I have a Vivitar Ser 1 70-210, which I
>guess is a 'one-touch' both focus and zoom with the same ring. At the
>Mirimar airshow, the aircraft (and runway) were close enough that I had to
>focus, and frame at the same time. I can not see doing this having to
>adjust two rings.
Experience and practice. I personally prefer the 2-touch zooms over 1-touch
zooms. Havin done a few airshows with zooms of both types, I'd say that a
1-touch is easier to use but more difficult use precisely. The only time I
would prefer a 1-touch is photographing a sporting event where the person is
coming towards me and I'm doing a long exposure where I desire to follow
focus and zoom out at the same time.
I think it comes down to a mindset. Do you view your zoom lens as a
variable focal length prime or as a creative zooming tool. I usually look
at it as a variable focal length prime so therefore a 2-touch is far better
for me.
Ken N.
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