Spectral sensitivity om BW films and perceived sharpness

[pkr1979]

Just an update from me on this. I shot a couple of sheets with Ortho Plus last week using a UV-filter and a yellow filter... I cant say for 100 % its what makes the film sharper, but these shots are as sharp (or sharper) as T-Max 400 - especially the one with a yellow filter.

 

[Nicholas Lindan]

Filtering light to a narrow spectral band will, obviously, remove chromatic aberration. Using a #25 red filter produces very sharp photographs by eliminating almost all chromatic aberration, though a UV filter may sometimes be needed in the mountains. (For a really black sky with a #25 combine it with a polarizer.)

A #25 doesn't work with Ortho film. A minus-blue variety of yellow filter leaves only the green component that the film is sensitive to, and again the lens' chromatic aberration is removed.

 

[Andrew O'Neill]

Filtering light to a narrow spectral band will, obviously, remove chromatic aberration. Using a #25 red filter produces very sharp photographs by eliminating almost all chromatic aberration, though a UV filter may sometimes be needed in the mountains. (For a really black sky with a #25 combine it with a polarizer.)

A #25 doesn't work with Ortho film. A minus-blue variety of yellow filter leaves only the green component that the film is sensitive to, and again the lens' chromatic aberration is removed.

Well, the #25 does in fact work on Ortho film... but one must apply a 512X factor. Impractical, but doable. I've tested the #25 on green latitude XRAY.

 

[_T_]

Changing your shutter speed by 2.3 stops is an increase in time of 500%. A 500% increase in time can definitely have a large affect on sharpness. Especially when shooting landscapes.

Things like wind in the trees will show 500% more motion blur.

 

[pkr1979]

Changing your shutter speed by 2.3 stops is an increase in time of 500%. A 500% increase in time can definitely have a large affect on sharpness. Especially when shooting landscapes.

Things like wind in the trees will show 500% more motion blur.

2.3 stops? Its buildings and rocks - not trees