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Topic: Going for a Tamron SP 500 f/8 (Read 5107 times)
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wallybarthman
Newbie
Posts: 10
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Bob - based on your article on mirror lenses I picked up a Tamron SP 500mm f/8 lens off of KEH for 189 (Excellent Condition) and a Adaptall to Canon EOS with AF Confirm. My question is this - will I be able to use my 1.4 and 2 converters (locked in place) with this lens since I got the AF confirm model? According to what I've read it will report EXIF data (50mm, 1.4 aperture which will be wrong) so I am thinking it should work fine.
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Bob Atkins
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Probably not. The 500/8 itself doesn't give very good AF indication even on it's own when used with a focus confirmation adapter. At f8 it's really too slow since Canon's AF system on all but a few of the pro level 1D series cameras requires at least f5.6. With a 1.4x it's f11 and with a 2x it's f16 so the focus confirmation adapter is highly unlikely to produce a confirumation signal.
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wallybarthman
Newbie
Posts: 10
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I should have been more clear - I figured the AF confirmation wouldn't work. What I meant was when I've used FD adapters I've found that the converters don't work if the lens is completely in place. What I meant to ask is whether with this lens and the AF confirm adapter if I'd be able to use it with a teleconverter since (and I'm assuming here) that the AF confirm adapter will trip the microswitch.
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