N90s/Tamron issues with aperture

rmear

New member
I'm new to all this so forgive me if this is a dumb request for information. I have an N90s that works well with my old manual lenses. I just picked up a cheap Tamron 177d 28-80 3.5-5.6 AF so I could try out the AF functions before putting more money into the kit. For some reason the camera reads the max aperture at 5.6 and minimum at 32. The lens is 3.5 to 22. I don't see anything in the lens or camera literature that I could do differently. Am I just missing something simple, or is it a compatibility issue?
 

Marcel

Happily retired
Staff member
Super Mod
The answer is quite simple. Your lens has variable aperture. At 28mm the max aperture is 3.5, when you zoom in at 80 it becomes 5.6.
 

rmear

New member
I understand that, however, at 28 it will not recognize anything below 5.6. A, M, S, P all limit to 5.6 and all extend to 32. Thanks though
 
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