Originally Posted by
Ole Tjugen
I think part of your difficulties lie in the focal lengths you have started with: The 65mm is very short, and it can be difficult enough to see anything at al, let alone the subtle differences you are looking for here. conversely the 300mm is rather long, and unless you have a huge old "boat anchor" of a f.4.5 lens, the smaller aperture can also make it difficult to see...
I suggest you invest in a good older 150mm to 210mm lens of reasonable aperture - no slower than f:5.6 - with plenty of coverage.
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