Originally posted by tram57 Thanks! Very informative.
I have compiled from this and other forums what experienced users know. Updated late 2009. Pl note that there is still no current TC that works with any SDM lenses . Two TCs are known to work with SDM and they are not current model. That means you have to buy them used or from ebay
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Tamron 1.4x Pz-AF MC4 AF works. SDM no re Brad (photo.net)
Tamron-F Pz-AF MC4 1.4x both SDM & AF works for DA*300mm re Dave (photo.net)
Tamron-F Pz-AF MC4 1.4x both SDM 7 AF works for DA*60-250mm as per dick eduard of dpreview
Tamron-F Pz-AF MC4 1.4x *I had with the lens is its compatibility with the Tamron SP 1.4x TC Sigma* 70-200mmHSM F2.8
HSM works fine at 70mm, but absolutely will not lock focus at or anywhere around 200mm, and I tested it in*full sun*- very high contrast conditions. Hunts back and forth,****
Ash of Pentaxforums said 090904
Tamron-F Pz-AF MC4 1.4x both SDM & AF works for DA*300mm as per Toshi, moderator of Pentaxforums.com.
Tamron-F Pz-AF MC4 1.4x both SDM & AF works only 10% of the time for DA* 50-135mm but hunts a lot re Miserere
Tamron-F Pz-AF MC4 1.4x with the Sigma 70-200mm -new with HSM . The HSM AF works. It really didn't work all that well indoors at night according to Dave Hollander of Photo.net
Kenko DG Pz-AF 1.5x TELEPLUS MC no AF no SDM on DA*300mm re Dave (photo.net)
Kenko DG Pz-AF 1.5x TELEPLUS MC AF works on older AF lens re Dave (photo.net)
Kenko Pz-AF 1.5X TELEPLUS MC only AF works; SDM no as per jgredline of Pentaxforums.com
Kenko Pz-AF 1.5x TELEPLUS SHQ both AF & SDM works for DA*200mm and all older AF lens re Daniel
Kenko Pz-AF 1.5x TELEPLUS SHQ both AF & SDM works for DA*300mm re Borno (Tom) of Pentaxforums.com ….SDM hunts a bit with DA*300mm
Kenko Pz-AF 1.5x TELEPLUS SHQ both AF & SDM works for DA*50-135mm but it does hunt quite a bit and often fails to lock focus according to heliphoto of Pentaxforums ; Buddha Jones of Pentaxforums not happy with its result ;
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Daniel, Toronto