Why is Pentax AW HD DA AF 1.4X Rear Converter so good?

Started Aug 9, 2014 | Discussions thread
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Petroglyph
Petroglyph Senior Member • Posts: 4,886
Why is Pentax AW HD DA AF 1.4X Rear Converter so good?

It seems like the same 4/3 formula they had for years for a 1.4X TC. I've recently got a chance to try one with a Tamron 90mm macro screw drive AF and Pentax DA* 60-250 SDM AF lens. I can't tell any IQ loss and the Tamron maybe seemed a little sharper. And that is saying something on the Tamron. Ricoh says the TC causes one stop shallower DOF which is a good thing IMO. Doesn't that mean the same bokeh at f/5.6 as there was at f/4 on the 60-250? Also the minimum focus distance is unchanged, brilliant. I did have to turn the AF switch off and on once to get the 60-250/TC combo to start auto focusing. But once it started it seemed as fast as without the TC. And the IQ at 350mm and f/5.6 was excellent. The Tamron seemed to focus a little slower with screw drive but I'm used to macro lenses focusing slowly anyway.

Cheers.

 Petroglyph's gear list:Petroglyph's gear list
Sony Alpha 7R II Pentax K-1 Pentax smc DA* 60-250mm F4.0 ED (IF) SDM Pentax smc DA* 300mm F4.0 ED (IF) SDM Pentax smc FA 43mm F1.9 Limited +4 more
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