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HVR-Z1 - Iris closing when fully zoomed in


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#1 Daniel Fletcher

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Posted 14 April 2006 - 06:33 AM

Hi,

I'm shooting a short in a couple of weeks on a Z1 (I have used it on one other shoot).

A curious thing I've noticed during indoor tech rehearsals is that when the camera is zoomed to infinity (e.g. when I'm setting focus), the iris closes slightly (F2.8) towards the end of the zoom, even with all settings locked: Gain (0), Iris (F1.6), and Shutter Speed (1/50).

It doesn't appear to be reacting to light, as the same thing happens in bright and dark environments.

Anyone know why this might be the case?

- Dan
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#2 grantsmith

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Posted 14 April 2006 - 07:06 AM

all zoom lenses do this. It is more noticable on the cheaper lenses like that on the z1 (as oppossed to a lens that costs $25000). Generally most lenses work best in the middle range (i.e. not extremelly wide or extremelly long). The z1 struggles at both ends - very wide looks slightly soft; and very long, as you have seen stops down noticebly). hope this helps
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#3 Daniel Fletcher

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Posted 14 April 2006 - 10:10 AM

hope this helps


It does. Thanks Grant.
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