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Searching for parfocal constant aperture lenses

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Ben Edwards
Searching for parfocal constant aperture lenses
on Dec 5, 2012 at 6:02:10 pm

OK, so my Sony Z1 seems to of gone wrong and as I am shooting a lot of DSLR stuff so thought rather than replace it I would upgrade my DSLR kit and get some suitable lenses. And by suitable I means lenses that are

1) Parfocul
2) constant aperture
3) Image Stabilised

The last may not be necessary for wide angle but the rest are.

I Have found some info about the Canon branded lenses but not much and nothing about 3rd party lenses. I did read somewhere that some of the new cheap Canon kit lenses are parfocul and also there must be some 3rd party top end lenses made for DSLR shooters (surly Zess make some).

I have writern up what I have found here http://www.funkytwig.com/blog/canon-dslr-lense-parfocal-constant-aperture and will update it as I get more info.

So if anyone knows of any parfocal lenses please let me know.

Ben
http://www.funkytwig.com/contact-us

--
Ben Edwards - Freelance Picture Editor
http://www.funkytwig.com

i5 550, Windows 7 / Mac Lion, Nvida 550 Ti, 8GB Mem


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Mark Shepherd
Re: Searching for parfocal constant aperture lenses
on Dec 12, 2012 at 7:14:02 pm

My Sony Z1 died and I made the move the Canon 5DMark11I about 6 months ago. As far as parafocal lenses with constant aperture, the only ones that I know of are the Canon 16-35 2.8 L (non IS), and the 70-200 VR11. The kit lens 24-105 is a great lens for video, but NOT a Parafocal. When you focus at 24 and zoom in, the focus shifts. Focus is a bitch in video, you have to stop recording to focus. The Live view with the 10X foom in works great for focusing (before shooting)


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Bob Cole
Re: Searching for parfocal constant aperture lenses
on Jun 23, 2013 at 6:35:46 pm

[Mark Shepherd] "When you focus at 24 and zoom in, the focus shifts."

The usual technique is to zoom into max telephoto, focus, then zoom out.

I'd be interested in whether anyone has made an actual lab test of parfocal Canon zooms.

Bob C


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