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01-16-2010, 05:39 AM   #1
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Are old push/pull zoom lenses better for video?

Hi all,

In my limited use of my K-x in video mode, I've found that zooming and focusing is difficult because when you zoom, the focus is thrown off, then you have to grab the other ring to focus. Wouldn't using a zoom lens that uses the same ring to focus and zoom be more usefull? Does anyone do that?

01-16-2010, 08:00 AM   #2
Dom
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IMHO no. It's much harder to get a smooth zoom.

One of the guys on here has a very nice set up with handles on his lens that make using the lens a lot easier. If I can find it I'll point you in the right direction.
01-16-2010, 08:11 AM   #3
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Pentax power zoom lenses

https://www.pentaxforums.com/forums/pentax-video-forum/76581-fa*-250-600-5-6-...ower-zoom.html

01-16-2010, 10:38 AM   #4
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QuoteOriginally posted by jake14mw Quote
Hi all,

In my limited use of my K-x in video mode, I've found that zooming and focusing is difficult because when you zoom, the focus is thrown off, then you have to grab the other ring to focus. Wouldn't using a zoom lens that uses the same ring to focus and zoom be more usefull? Does anyone do that?
True 2 ring zooms should hold focus when focusing. that is the definition of a zoom lens.

Vari focal lenses do not hold zoom when focusing,

Many single ring zooms are vari focal type because as you state it is easier to zoom and focus with a single ring, but they don't always have to be varifocal. My vivitar series 1 70-210 F3.5 is a true zoom but also a single ring zoom. push pull for zoom and turn to focus. But while zooming if you pull straight back, you retain focus Great lens BTW but a little heavy to hand hold using live view, and no tripod mount on the lens and at 2 pounds that puts a lot of stress on the camera body if you use the body tripod socket

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