Quote:
Originally Posted by MrB
Haha, thanks Greg, I was worried I had gone overboard with the colour!
Saturation was one click shy of maximum in DPP.
The greatest thing I've taken from this is how good the lens is, there is some CA (red side) but the stars in the corners are near perfect.
Best FWHM value in APT's 'focus aid' tool was at maximum twist on the focus ring. Being an old M42 screwmount lens I might try a few other EOS adaptors to see if I can find one with a different thickness, that might allow me to improve on the focus and reduce the CA a little.
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Pentax SMC lenses are good performers. I have the 6x7 55, 165 and 300mm. The 55mm is a dog. The 165 superb with no distortions or CA. The 300mm is also good but I have not done any colour shots with it. There is an ED version.
One caution about old Pentax SMC lenses some have thorium oxide in the glass to increase the refractive index (probably mostly fast lenses). This is slightly radioactive. You can find lists of the radioactive lenses on the net. Google radioactive lenses.
Greg.