Has anyone with a K-5II or K-5IIS retested SDM lenses with a TC?

Started Feb 1, 2013 | Discussions thread
eenymac Senior Member • Posts: 1,144
Re: Thanks for your reply.

Ok, here is what I found with a bit of playing this morning.

1. In normal operation, using the Kento Pz-AF 1.5TC, the focus was just hunting all the time and it would take a lot of adjustment to lock.

2. Switch to Live View, set to CD-AF and it would lock every time without fail.  Set to PD-AF and it was back to hunting for focus.

Interestingly, I then put on the Bigma with the TC and switched back from Live View.  At higher FL's it worked just fine, but at shorter FL's it would occasionally miss focus, but it was still better than the DA*300mm performance which just hunted every time. So, I CAN use it on the 300mm, as long as I am using LIve View, which I rarely, if ever, use anyway!

Shame really as the Kenko 1.5x TC's are optically quite good and I've had little IQ drop with it when used with the 300mm and Bigma.

 eenymac's gear list:eenymac's gear list
Pentax K-3 II Pentax K-1 Pentax smc DA 16-45mm F4 ED AL Pentax smc DA* 300mm F4.0 ED (IF) SDM Pentax smc DA 35mm F2.8 Macro Limited +7 more
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