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 Post subject: 2x convertor
PostPosted: Tue Aug 25, 2009 10:37 pm 
i got a 2x converter with my sal 75/300 lens, when its attached the auto eye focus will lock focus, but when i go to press the shutter button lens srats to zoom in and out uncontrolable. it continues until i remove the converter. can you tell me what i'm doing wrong. this is my frist dslr.

 Post subject:
PostPosted: Tue Aug 25, 2009 11:39 pm 
Which teleconverter did you get? A Kenko, Minolta, or Sony?

Any 2x TC is going to narrow your aperture by two stops. At 300mm (600mm with TC), your lens will go from F/5.6 to F/11. There is no way it will be able to auto focus with so little light. If you really want to use it (I would suggest against it), use manual focus. To maintain AF, keep the total aperture under F/8.

 Post subject:
PostPosted: Wed Aug 26, 2009 10:20 pm 
I believe the SAL75300 isn't compatible with Sony TCs.

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