on 2004/10/17 8:27 PM, AG Schnozz at agschnozz@xxxxxxxxx wrote:
> I've found
> that when comparing same-size images, the Zuikos outperform the
> digicam by over eight steps... However, when drilling down
> to pixel level, five of those steps are beyond the resolving
> capability of the sensor! I ran out of pixels.
Now that's interesting.
> The biggest suprise was how well the A1 actually did. The trick,
> though, is to shoot RAW. I lost an entire step, and sometimes
> more, when shooting JPEG.
Interesting and useful.
> Oh, when scanned, most, if not all, of that resolution gain with
> the film is gone. As long as I stay optical the increased
> resolution is gained. The moment I digitize, the playing field
> is leveled. I wonder what a 5400dpi scanner must be like...
That's interesting too, but what's your scanner resolution?
> But, through it all, it also means that a quality 8MP sensor
> will equal the Zuikos maximum resolution.
Uh, say what? Given extract #1 above, that would mean the five steps
together change resolution by sqrt(5/8)... or about 0.8. Is that correct?
I think you may be in right ballpark though, at least for low-contrast
scenes (your test target is probably high-contrast, no?). Most films quote
around 50 lp/mm at low contrast, which works out to 8.6 MPx. So unless you
want high-contrast, graphic images with high resolution, 8 Mpx may be OK.
It's certainly where I start to get really interested (other issues aside,
like being mostly happy with what I've got and only very weakly motivated to
spend money).
Andrew
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