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Showing results for tags 'parfocal'.
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I would be grateful on any advice on the zoom lens on my nizo 561 macro. I've noticed that, on shots where I've zoomed in on an object and focused, start shooting and slowly zoom out, then on viewing the processed film, the image I'd originally zoomed in on and focussed on becomes out of focus as I zoom out. I researched type of lenses and obviously it comes down to whether the camera's lens is of a parfocal or varifocal type. I understand that any cine camera would have to have a parfocal lens, to preserve the focussing on an image during a shot where the zoom might be changing. Does anyone know if super 8 cameras (and my Nizo 561 in particular) do indeed only have varifocal lenses? I would be very grateful if anyone can suggest a super 8 camera which they know for certain has a proper parfocal lens. I also thought that the correct procedure for focussing on objects is to zoom in to maximum zoom, focus and then zoom out to take the shot. If the camera doesn't have a parfocal lens, does this not therefore make this technique redundant, guaranteed to actually lead to an out-of-focus shot? Any advice gratefully appreciated!
Hello all! I'm looking for insight on the Canon 70-200 F2.8 IS II. Canon says that this lens is not parfocal and more often than not this is true where the image looses focus while zooming. For example: - at 70mm you focus on your subject - you then zoom to 200mm - your subject is now out of focus From time to time however I have come across version that magically hold focus when you crash zoom in. Has anyone discovered why this happens, or if there is a way to identify versions that work better than others? Any insight would be much appreciated, even if it's just letting me know that yours holds focus while zooming. Thanks in advance!