photo sharing and upload picture albums photo forums search pictures popular photos photography help login
Type your message and click Add Comment
It is best to login or register first but you may post as a guest.
Enter an optional name and contact email address. Name
Name Email
help private comment
Stephen Nickles | profile | all galleries >> Lens Evaluations >> Tamron 90/2.5 SP Adaptall MF Macro tree view | thumbnails | slideshow

Tamron 90/2.5 SP Adaptall MF Macro

TAM90_f2.5
TAM90_f2.5		 TAM90_f4.0
TAM90_f4.0		 TAM90_f5.6
TAM90_f5.6		 TAM90_f8.0
TAM90_f8.0
TAM90_f11
TAM90_f11		 TAM90_f16
TAM90_f16		 TAM90_f22
TAM90_f22		 TAM90_f32
TAM90_f32
TAM90_2X_f5.0
TAM90_2X_f5.0		 TAM90_2X_f8
TAM90_2X_f8		 TAM90_2X_f11
TAM90_2X_f11		 TAM90_2X_f16
TAM90_2X_f16
TAM90_2X_f32
TAM90_2X_f32		 TAM90_2X_f44
TAM90_2X_f44		 TAM90_2X_f64
TAM90_2X_f64		 tamron90_2.5.JPG
tamron90_2.5.JPG

comment | share
John Winterbourne25-Sep-2010 09:29
Another P.S. The reflection problem only shows with the lens mounted directly to the camera. Use of either the 2xTC or the bespoke extension tube nullify the problem.
John Winterbourne25-Sep-2010 09:25
Hi. This is an increasingly well reported "fault", and I think it is now generally agreed that is caused by reflections of the iris blades back from "shiny" dslr sensors - a result of the plane rear element in trhis design. Nothing to do with lens coatings and nothing to do with lens hoods I'm afraid.

I have both versions, and there is a very slight difference at about f/11.

I am confident that this is the true reason, as I tried two different monts on my Nikon dslr. a) Adaptall Nikon AI mount, the blue reflection exactly as described here b) Adaptall M42 mount on an M42/Nikon adapter with lens to give infinity focus, no trace of the reflection at f/32. The correcting lens in the M/42 Nikon adapter has a curve.

I put "fault" in quotes because this fabulous lens was of course designed for film cameras, and as film has a matt surface the reflection was never a problem.

P.S. I'm not up to speed on Minolta, so I'm guessing here but does a Maxum adapter have any glass in it?
Dekie 23-Dec-2006 00:45
There are two versions of this lens. The second version with 55mm filter thread, a deeper lying
front lens, a bayonet hood and better coatings.
Both versions are excellent on my Min 7D with the Maxum adapter.
SetterSpeaker 04-Dec-2006 02:30
Very surprised by your results for the Tamron SP 90mm Macro! My 52B on the EOS 350D shows obvious rear element flare from f/16 up, and some intimation at f/11 if you look closely. At f/8 and wider its fine. The flare is a distinct, centered, cyan-tinged spot which increases in intensity but decreases slightly in diameter as the aperture is shut down. It is most pronounced at infinity focus.

This phenomenon is well known for poorly coated, pre-digital lenses -- I'm just shocked that my Tamron shows so poorly, because otherwise I regard it as one of my finest lenses. Maybe yours is the later 55B model, which may have had better coating?

I don't have any such problem with, say, the Canon FD 50mm macro -- but of course that lens is useless for anything except close-ups.
click on thumbnails for full image