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Message: <blockquote data-quote="STM" data-source="post: 141297" data-attributes="member: 12827"><p>Thanks, even a blind squirrel finds a nut every now and again! And I did it without a flashmeter either. I had figured out what the GN for that flash was using that Reflectasol years before and just calculated distance from the subject based on ASA and f/. I use the 105mm f/1.8 AIS now, have for several years. I did not really gain anything with the f/1.8 over the f/2.5 except speed. It is a good bit heavier and uses 62mm filters instead of the standard 52mm. Resolution wise I have never been able to see a difference and all the reviews I have read bear that out. Depending on who was doing the reviewing, some have said that the f/1.8 was actually a little sharper than the legendary f/2.5 .</p></blockquote><p></p>