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Auto Tamron 28mm f2.8 (Adaptamatic)

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Macro Ratio

Year Introduced:

Tested with...

62mm or 58mm


f2.8 - f16

.22 meters



T2i and 6D


     This is a somewhat rare lens these days.   The adaptamatic mount was abandoned in favor of the adaptall mount.   It was in production for only four years.   My copy has an M42 mount.   It handles well on the T2i.    It is very well built.   Focus dampening is perfect.   The only issue I had was inconsistent exposure in aperture priority mode.   Usually the T2i overexposes at f5.6 & up when I use adapters.  With this lens the T2i gradually overexposes from 3.5 up.    

     It is soft at f2.8 with noticeable vignetting.   At f4 it tightens up.    At f5.6 it is tack sharp.   
     Contrast is a bit low thru the entire range of f stops.   Shadow detail is excellent.  
     Colors are a bit muted but accurate.  

     It lacks BBAR coating but it handles fringing and flare well.  Use a lens hood at all times to preserve contrast.   

     Bokeh is not very smooth but it is consistent and not too distracting.   Bokeh fringing is very well controlled.


ISO 400 - f2.8 - Vignetting/Distortion


ISO 400 - f4 - 


ISO 400 - f4 -100% crop


ISO 800 - f5.6 -100% crop


ISO 400 - f4 -flare

loss of contrast



ISO 400 - f4


ISO 800 - f5.6 - 50% crop


ISO 800 - f3.5

Bokeh Fringing Test
Eos 6D


f2.8 - minor shift


f4 - nearly clean


f5.6 - very clean

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