Listing Parafocal lenses for A-mount

Started Apr 17, 2012 | Discussions thread
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Plastek Contributing Member • Posts: 619
Listing Parafocal lenses for A-mount

Thought that if we have so wide community here, than perhaps we can gather some knowledge in one place

Sony released 16-50 f/2.8 advertising it as a parfocal lens (meaning: it doesn't change focus while zooming) - what's very useful for videophotographers.
What other parfocal lenses do you know?

as far as I could find an info about it following lenses are parfocal. Cannot test it myself though as I happen not to have any of these.

  • Sony 28-75mm f/2.8 SAM

  • Tamron AF 17-50mm F/2.8

  • Tamron AF 24-135mm f/3.5-5.6 SP AD IF

  • Tamron AF 70-300mm f/4.0-5.6 SP Di VC USD (???)

  • Sigma 70-200 f/2.8 EX DG OSS *

  • Sigma 24-70 2.8 EX *

* lens behaves almost like a parfocal - it has a focus shift but it's relatively slight one

Any concrete info, or do you know any other zooms that are parfocal?

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