Photography: Quantaray 70-300mm F/4.0-5.6 Zoom Lens - Quantaray

Photography: Sigma 70-300mm f/4-5.6 DG Macro Telephoto Zoom Lens for Canon SLR Cameras - SIGMA

Photography: Tamron AF 70-300mm f/4.0-5.6 Di LD Macro Zoom Lens with Built In Motor for Nikon Digital SLR (Model A17NII) - Tamron

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Quantaray 70-300 Pentax Popular Q&A

Q: Pentax Ist DL auto focus not working anymore after using Quantara...
A: It seems to be a connection issue between the Lens and the Camera body. Perhaps the mount is not true to the body Ask Pentax about this their Technical Support ... Read More »

Q: Does the Quantaray 70-300 lens only work on manual focus?
A: The current Quantaray 70-300mm DI Digital Series AF Zoom Lens, is of course an auto-focus camera. It costs about $150 new at a store near you. Read More »

Q: How to mount Quantaray 70-300mm F/4.0-5.6 Zoom Lens in Sony Alpha...
A: This 3rd party lens (like all of them) makes lenses specifically to fit Nikon, Canon, Pentax, Minolta, etc. camera body mounts. Each has a style mount that is u... Read More »

Q: When I use my Quantaray 70-300mm lens, sometimes the autofocus do...
A: Manually focus! Seriously, when you manually focus does it feel weird? I got sand in a lense once and it got all scratchy when it moved (zoom or focus) and didn... Read More »

Q: Will the various Quantaray 70-300mm lenses be compatible (fit & f...
A: John: I tried to answer the question as best I could. the simple direct answer is sometimes they do and sometimes they don't. The Quantaray lenses can come with... Read More »