straight to the point.
lens: 70-210mm f4-5.6 - with aperture ring
i shot @ 210mm using f4 and 5.6 the only diff i see was that the @f4 it is more exposed (which is correct) but of cause it is a f4-5.6 lens so there has to be reason it should be f5.6 @ 210mm. so can someone enlighten me regarding this issue?
ps. i am afraid that i forget to switch to f5.6 @210mm when i shoot on my slr. is there any issue like distortion, fade edges or whatever that is suppose to be happening?