I bought this item brand new from ebay store Wolfes-Camera and the price I paid was fairly decent for $69.99. I doubt initially if the AF would work at all when I purchased this item. And I tried it on both of my Tamron 28-75 f/2.8 and Tamron 70-300 Di LD Macro and auto focus works though there is more obvious focus hunting for the long Tamron zoom in the long end
Auto focus is slower than the Tamron 1.4x Pz-AF MC4 TC. Perhaps the field of view is narrow at 510mm, a busy surrounding and low light will have it hunt for focus. Once target is in focus, it is not as bad. And I am more than thrilled to have a 510mm for bird photos from a good distance. Some test shots with Tamron 70-300 Di LD Macro in ISO 400 and mostly f/8.0.
Impressions & Notes:
- AF obviously works and I have tried it successfully on Tamron 70-300 Di LD and Tamron 28-75 f/2.8
- AF is slower in Promaster 1.7x as compared to Tamron 1.4x TC
- I am extremely surprised that PF/CA are not seen yet with the TC. I shot the similar locations when the bird is resting with backlighting branches, Tamron 1.4x TC all end up in purple tree but not so with the Promaster 1.7x. I am hopeful that this TC works better with PF/CA control.
- Color and contrast are a bit flat but reasonable in the shot
- 510mm is very achievable with the TC and IQ are yet to be confirmed with more use
- I am happy as a clam to get a 510mm rig with this TC
- The Promaster weighs 4 oz and it is not that much bigger than the Tamron 1.4x TC and hand-holding with Tamron long zoom is very feasible. Though SR stays at 300mm for the long end and my short trial seem to have reasonable sharpness.
- Most of my initial test shots range from 10 to 15 feet away from the birds, a longer distance testing will help to judge the TC.
- IQ with shots in close range shorter than 30 feet seems very good, SR at 300mm in long end still helps in shorter distance shooting.
- IQ at full extension to 510mm with subjects at far distance seem to have more problems with blur images.
- In all testing, AF works effectively in good lighting condition.
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