Thanks very much for the posts.
I have found this lens/camera combination to work optimally at f4.5.
I am going to take it to one more level now and get those stop-down covers - anyone know where I can source one from that would fit the 50mm Canon lens?
Mike - you asked an earlier question about how much cropping was had on the image (of Eta). Other than minor alignment artefacts, the cropping was miniscule. However, on this image, I reframed the target halfway through, so there was some cropping, but again, really small.
cheers
Martin
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