Originally posted by niels hansen My K 30 suffers occasionally of the well known aperture problem. . I have tried to use it with a tamron 70 - 300 mm macro with an aperture ring. I set it on a fully open aperture and AF.
It seems to work well . Can I rely on that every time ?
The reason I ask is that I will lend it to A youngster in the family that wants to photograph animals. He is a week boy that does not deserve too many problems. In this case we want reliabel exposure and AF, its is a minor matter that maximum aperture does not give optimum sharpness . regards
Yes, it will work reliably every time.
The camera meters wide open, so if you set the aperture to "wide open", metering will match photograph actually taken; green button metering is needed only when you have set aperture to a smaller opening.
As mentioned, you will get reduced DOF, but if you can "live with" that .....
I took the example photo in our backyard a few minutes ago (*).
The only "PP" was to down-scale for display here.
I used a Pentax-FA 28-105mm f/3.2-4.5 lens set at f/3.2 and Av mode on my K-30 {which now suffers from DIS}.
(*) Actually, I took half-dozen photos of various scenes, but one is enough for this