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Hi.
I took a few moon shots a few days ago, and was a little disappointed with the results. I know there are many variables - mostly outside my control at that - but there was something I noticed with the lens which slightly baffled me.
The lens we're talking about is the Zuiko 70-300 F4.0-5.6 ED.
I had it on full extension and the AF appeared to do the job of sizing up the focus for the shots. However they were far from sharp.
So I tried MF instead but was surprised, when the extending the focal length, to 'overshoot' the focus on the subject. When the focus went to infinity, the shot was noticeably back out of focus.
How far away does something have to be to hit infinity with one of these lenses? Is 250,000 miles not enough?
I notice, from looking through the instruction manual and the utility menu options on the camera, that there is a facility to change AF settings ("AF FOCUS ADJ.") depending, I guess, on which lens is plugged in at the time. There are options to set from default data, and lens data.
Please can someone tell me if this is a kind of re-calibration technique, or is it intended for a completely different purpose? And in either event, would it help in my situation?
Any help would be gratefully received. The manual mentions this facility, but does not explain why you might want to use it.
I took a few moon shots a few days ago, and was a little disappointed with the results. I know there are many variables - mostly outside my control at that - but there was something I noticed with the lens which slightly baffled me.
The lens we're talking about is the Zuiko 70-300 F4.0-5.6 ED.
I had it on full extension and the AF appeared to do the job of sizing up the focus for the shots. However they were far from sharp.
So I tried MF instead but was surprised, when the extending the focal length, to 'overshoot' the focus on the subject. When the focus went to infinity, the shot was noticeably back out of focus.
How far away does something have to be to hit infinity with one of these lenses? Is 250,000 miles not enough?
I notice, from looking through the instruction manual and the utility menu options on the camera, that there is a facility to change AF settings ("AF FOCUS ADJ.") depending, I guess, on which lens is plugged in at the time. There are options to set from default data, and lens data.
Please can someone tell me if this is a kind of re-calibration technique, or is it intended for a completely different purpose? And in either event, would it help in my situation?
Any help would be gratefully received. The manual mentions this facility, but does not explain why you might want to use it.
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