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Review statistics for old4570
Lenses Added 2  (View Lenses Added)
Reviews Posted 6  (View Reviews)
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Cosina MC Macro ( Tokina ) 28-80mm F3.5-5.6
Latest Review Posted Cosina MC Macro ( Tokina ) 28-80mm F3.5-5.6
http://i1033.photobucket.com/albums/a420/old4570/28mm_zps0d340a62.jpg


The number one issue with this lens is over exposure as you Zoom up ..
This first image was taken @ 28mm and the amount of light or exposure is about correct ..


http://i1033.photobucket.com/albums/a420/old4570/50mm_zpsaf0178dd.jpg


This next one is @ 50mm and you will notice the increase in brightness ...


http://i1033.photobucket.com/albums/a420/old4570/80mm_zps421c76f7.jpg


Now we are @ 80mm and you can see how severe the over exposure is ...


If you adjust AV in the camera to -2 , this is what you get @ 80mm


http://i1033.photobucket.com/albums/a420/old4570/minus2AV_zps7460f517.jpg


To bring exposure back @ 50mm you want about -1 on the AV ..


This really is unacceptable behavior from a lens ( Green mode )


Now as for the lens being Macro ? No not really , its more of a close focus lens ( 50cm )


What did impress some what is how well the lens can focus ( When AV is correct ) When the AV is over exposing , the lens does focus poorly ...


It is a plastic lens , the lens barrel is a little generous ( lose ) in the body , but does not seem to affect images , unless its the cause of AV issue when zooming ? ( I dont think so )


Its not a bad lens except for the AV issue , so I cant call this one a good lens either ( sample I have )
With so many old Pentax lenses floating around out there ( Auto focus 28-80 ) , I mean I was curious , so if your not curious , and you...



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