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Hey,
Plossls generally run at 80% ER of the stated Focal length. Use the smaller F/L's for a while and see what gets uncomfortable for eye placement and use. That will give you a rough range of ER you should be looking for.
As for good ep's, you may as well ask what's a good car... but at least with car's you've probably have some experience and preconceived preferences...
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