2 touch?

eckinator eckinator at gmail.com
Sun Jul 18 12:58:44 EDT 2010


I'll tell you as soon as I've finished my telezoom to trombone
conversion project. I've drilled holes through all the elements but it
sounds like an elephant's fart at best so far... Also the K mount
doesn't seal against my lips too well, I might have another try with
an M42...

2010/7/18 Richard D Bush <rbushidioglot at comcast.net>:
> Do the push-pull-twist zoom/focus rings help these lenses be any better in
> tune than the average trombonist?
>
> RB
>
> On Jul 17, 2010, at 2:16 PM, Bob W wrote:
>
>> What is meant when a lens is described as "2 touch," e.g., 35-70 F4 SMC
>> A (58) 2 TOUCH ZOOM.
>>
>
> it means the zoom ring and the focus ring are separate. Some lenses, such as
> the 70-210/4, use the same ring for both - to zoom you push/pull like a
> trombone, to focus you twist
>
>
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