Aperture blades does it matter on wides?

[scrichton]

I have a 135mm and a 90mm f5.6. Will a hexagonal compur or the more multi-bladed aperture from the 135m show any noticable difference on the 90mm? I have swapped them over for just now but have still to calculate each other apertures therfore am thinking I might swap back for ease of use.

Steven

[Gene McCluney]

Your OOF highlights will be bigger with the longer focal length lens, thus the shape of the aperture blades will be more of a concern with longer lenses. The wider the lens, the less chance of OOF areas. Most people feel that the "shape" of the aperture blades affects the Bokeh...or OOF rendering.

[scrichton]

So seeing as 90mm is normally stopped down using a smaller number of blades really shouldn't be too much of a degredation of sharpness etc ... and the rounded aperture will be better suited to the 135 when shot wide eye'd

[Gene McCluney]

Yup

[scrichton]

made the change and I feel go-od. Plus the newer black compur looks much more at home on the evil black sinar panel.