« on: November 16, 2012, 09:01:27 AM »
Too long to wait.
I'm switching to Nikon
I'm switching to Nikon
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BTW, both the 85 and 100 needed zero MFA.I was quite amazed my 85mm was the same after running focal repeatedly.
All my flashlights are LED too I have a problem
Mine, too - but they're battery powered, right? Direct current means no fluctuations, no flicker. It's not the bulb that's the problem, per se, it's the alternating current in combination with a bulb that has a fast response time (since incandescent bulbs are basically just heated tungsten, there's no flicker because the hot metal doesn't cool down significantly at 50/60 Hz cycles). 'Halogen' bulbs are incandescent bulbs with hot tungsten, but there's a bit of a halogen gas (bromine, etc.) added into the inert gas in the sealed bulb.
I know, I know...TMI...
Flashlights. LOTS of flashlights.
Actually, a couple of those portable halogen work lights from Home Depot would do nicely, and at less than $20 each, they're cheaper than many LED 'bulbs'.
I've only done 2 lenses so far, my 85mm 1.8 (which comes up with a different number, near zero, each time) and my 50mm 1.4 that won't calibrate at all.For lighting, I learned the hard way not to use CFL or Fluorescent Tubes
Lighting I think is an issue, but the mac beta says sorta weird things about iso, so who knows . . . not a lot of time on my hands
They drive FoCal nuts!
Can you add "what a useless lens" to your poll?
Many things going on.
Depending on scene, noise is more or less apparent. Large areas of OOF 'negative space' show noise more prominently (subjectively, because there's nothing else there to pay attention to, you eye starts looking for patterns).
Shutter speed does affect noise, but meaningfully only with longer exposures (you'll notice more noise at the same ISO in a 0.5 s exposure vs a 1/200 s exposure, but not between 1/1000 and 1/640.
ISO matters - 'tweener' ISOs have more or less ISO noise than the full stop settings, depending on camera model. So, ISO 500 is noisier than ISO 800, while ISO 640 is slightly less noisy. That's beacuse with a full stop base ISO, the up tweeners are pushed (1/3 stop up, e.g. 125, 250, 500, 1000, 2000, etc.) while the down tweeners are pulled (1/3 stop down, e.g. 160, 320, 640, 1250, 2500).