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08-22-2012, 06:46 AM   #1
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sigma 1.4X tc versus vivitar series 1 1.4X TC

I have a Tamron 400 / f4 which works great with a generic EOS adapter + canon 1.4X TC + EOS 50D. However this only works in stop-down mode and I'd like to get this set-up working on Pentax. Ultimately I'd like to set the aperture ring to A, attach a 1.4X TC, and shoot in Av mode.

I do have a real Tamron adaptall PKA mount. I did purchase a tamron 140F 1.4X TC but I could never get it to work ( and I tried countless ways ), on either the pentax or canon so I returned it to KEH.

I know the latest sigma 1.4 X TC ( about $250, the EX APO DG one) is not marketed as a universal type converter, but does any body have any experience with this TC and Tamron adaptall lenses? THe rear element of the 400 / f4 is nested inside so there shouldn't be any interferences. If it fits and attached does it pass the new aperture value to the camera and allow shooting in Av mode?

Also there's a vivitar series 1 1.4X TC, less than $100 (!), that seems to be back in stock at B&H. This doesn't seem to be in the lens review database, does anybody have any experience with this? I'd be amazed if this was a high quality TC given the low price but maybe i'm wrong.

08-22-2012, 10:10 PM   #2
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Several users on the other forum have reported that the Vivitar 1.4x is good. I don't own it.

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1.4x, adaptall, experience, mode, pentax help, series 1 1.4x, sigma 1.4x tc, tamron, tc, vivitar series
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