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03-24-2012, 10:24 PM   #1
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Tamron Adaptall MC 105mm f2.5 vs. the Tamron Adapt-a-matic 105mm f2.5

Can anyone tell us if there is any difference in the optics or any other aspect of the two Tamron 105mm f2.5 lens versions: Adapt-a-matic vs. the Adaptall?

03-25-2012, 10:54 AM   #2
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QuoteOriginally posted by Pepe Guitarra Quote
Can anyone tell us if there is any difference in the optics or any other aspect of the two Tamron 105mm f2.5 lens versions: Adapt-a-matic vs. the Adaptall?
I have the Adaptall 105/2.5 (CT-105) but I have yet to see an Adaptamatic 105/2.5 (JOG-25AU). According to adaptall-2.org, they are both 4 element, 4 group lens, same max aperture opening but JOG-25AU has shorter minimum focus. They both have an A/M slide switch, I can confirm the CT-105 with a PK/A Adaptall-2 adapter will let you shoot in A mode on my Pentax DSLRs but I am doubtful if an Adaptamatic lens will do the same. I would say they share the same optical formula (difference might be the lens coating or lack of?)
03-25-2012, 01:34 PM   #3
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I read somewhere that the Adapt-a-matic were the last lens done manually by Tamron, before they started using computers for the design and construction. That would be a good reason to have one.
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