When starting off I assumed the 'loupe cult' to be BS. Then I noticed that at 20x16 some prints weren't criticaly sharp. So, I bought a cheap loupe to test . . .
First I would focus naked eye, til I was SURE I had nailed focus. Then I'd loupe it. 50% of the time I had to make some minor tweak. Shocking. So now I carry a Silvestri 6X (I think) loupe. It is fabulously clear and sharp. If I shoot chrome, it costs £2.20 a sheet, plus £2.50 to process- that's a total of £4.70 (or nearly 10 US dollars) every time I click the shutter. Why risk that shot to save 30 seconds??
OKay- 90mm lens, f22, you'll have lots of dof, and it'll probably save your ass. But 360mm lens, f5.5, at 10 feet? There's NO dof. Why guess focus? Use a loupe.
PS No. I'm not a loupe salesman
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