Eric Weir wrote: >There are things that were said, though, that I did not hear. That is, didnt >understand. >And probably am not going to understand when you explain it to me. Whats an >ISO invariant camera?
In the early days of digital it was standard practice to apply some amplification to the signal from the sensor prior to analog-to-digital conversion. This was how one increased the ISO setting. It's still used in some sensors today but other sensors change ISO setting strictly through software. These are said to be "ISO Invariant". (Most Sony sensors are ISO Invariant and all the ones used in recent Pentax cameras. What this means is that if you set the camera to, say, ISO 800 and have a scene that meters at 1/100 sec. at f/5.6 you can, using manual exposure, turn the ISO setting down to ISO 100 while keeping the shutter speed and aperture at 1/100 f/5.6 even though the meter will tell you you're 3 stops underexposed. If you just compensate later in Lightroom or Photoshop the results will be the same as you'd have if you'd shot at ISO 800 in camera. (This assumes one is shooting raw format, of course.) >If Im to ETTR just enough to avoid clipping highlights, how much is >too much? I shoot RAW. Should I ignore the histogram? Don't ignore the histogram! *Any* clipping represents image data that's gone forever. -- Mark Roberts - Photography & Multimedia www.robertstech.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
