06-23-2010, 02:36 AM
[quote name='wim' date='22 June 2010 - 08:52 PM' timestamp='1277203964' post='650']
I would think you would get backfocus errors (longer wavelength and hence focuspoint). So probably removing shims to lengthen the pathway to the focusing screen, which might be difficult, because it could well be there aren't enough shims to take away. Considering the differences between lenses, a can of worms is indeed an apt description.
[/quote]
One thing I didn't mention before was the differences introduced by the thickness of the IR filter that replaced the original IR cut filter. The original filter was a multi-layered one that also had the two AA filters and the sensor cleaning layer. The IR filter that was put on is most probably thinner, because it's a specially made on-sensor filter (rather than a glass filter cut to size).
The good news is that I don't need the VF to work for all the lenses. Just my 200 because the rest can AF without a problem. All that needs to be done is make the focusing screen distance consistent with the sensor distance.
[quote name='wim' date='22 June 2010 - 08:52 PM' timestamp='1277203964' post='650']
In short, I think the simplest and easiest way likely is to figure out the different diopter settings on the VF for each lens, and do MF with the -S type screen <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.
[/quote]
I'm not sure how diopter adjustments can help lens focus... the lens image is already made on the focusing screen and any diopter adjustments will only affect how the eye focuses on the focusing screen, right?
GTW
I would think you would get backfocus errors (longer wavelength and hence focuspoint). So probably removing shims to lengthen the pathway to the focusing screen, which might be difficult, because it could well be there aren't enough shims to take away. Considering the differences between lenses, a can of worms is indeed an apt description.
[/quote]
One thing I didn't mention before was the differences introduced by the thickness of the IR filter that replaced the original IR cut filter. The original filter was a multi-layered one that also had the two AA filters and the sensor cleaning layer. The IR filter that was put on is most probably thinner, because it's a specially made on-sensor filter (rather than a glass filter cut to size).
The good news is that I don't need the VF to work for all the lenses. Just my 200 because the rest can AF without a problem. All that needs to be done is make the focusing screen distance consistent with the sensor distance.
[quote name='wim' date='22 June 2010 - 08:52 PM' timestamp='1277203964' post='650']
In short, I think the simplest and easiest way likely is to figure out the different diopter settings on the VF for each lens, and do MF with the -S type screen <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />.[/quote]
I'm not sure how diopter adjustments can help lens focus... the lens image is already made on the focusing screen and any diopter adjustments will only affect how the eye focuses on the focusing screen, right?
GTW