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General photography questions and answers: Discuss Lens Query???...Have just purchased the Canon 50D, and so far quite impressed, anyway have got some money coming my way in ...
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Old 11-07-2009, 15:49   #1 (permalink)
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Lens Query???

Have just purchased the Canon 50D, and so far quite impressed, anyway have got some money coming my way in the next couple of weeks, and methinks I would like the Tamron SP 90 2.8 Di as a cheap alternative for a portrait/macro lens, but have been informed that if I ever get to own a 1D/5D Canon, that the Tamron Di wouldn't fit........................is that right
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Old 11-07-2009, 16:19   #2 (permalink)
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Re: Lens Query???

Some lenses are designed to be used with crop factor sensors. These lenses will not work on full frame cameras.

I think that the Tamron designation for crop factor sensor lenses is Di-II. the 90mm macro is a Di lens, and the Tamron web site describes the Di series as

'Lenses designed for superior use with digital SLR cameras and conventional cameras'. (My bold)

I would take it that the 90mm as a Di lens will work on 'conventional cameras' so should be OK for full frame, but it would be wise to check it out before buying.

Annoyingly, the new look Tamron web site no longer groups the lenses into Di and Di-II that had the information on what bodies they were designed for in the section.
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Old 11-07-2009, 17:00   #3 (permalink)
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Re: Lens Query???

Seems like you could catch a cold without knowing the in & outs of this lens, cheers.
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Old 11-07-2009, 21:44   #4 (permalink)
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Re: Lens Query???

Reading different reviews the general opinion seems to be that you need to splash the cash on the glass to do the 50D justice.

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Old 12-07-2009, 10:22   #5 (permalink)
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Re: Lens Query???

I was intrigued by the Dpreview conclusion that the 50D records less detail than the 40D (assuming I read it right) and that digital receptors have reached the limit of scaleability. Perhaps they really have reached the practical limit for receptor size. On the other hand, theoretically, the limit is actually twice the wave length of the light being read, so perhaps it's just an engineering constraint and someone will blast past it tomorrow.

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