No, I try to say that lens resolution matters a lot. I see it as follows: If I have a good lens with 100 lines/mm, that means 2400 lines on 24mm
If I have a (simplified) sensor with 4800pixels on 24mm I could show these 2400lines If vertical lines, I would see only 2400lines if they fall exactly on the raster : one pixel on, one pixel off. If the whole picture shifts by half a pixel, EVERY pixel receives 50% light and you see no lines at all. If you rotate the vertical lines slight ly, you see yaggies. My statement is that 100lines /mm lens resolution is worth much more than 200 pixels /mm And lens resolution is still better than the pixel density can show Greetz Jos J. C. O'Connell wrote: > I dont know why you edited my post but your reply to it makes no > sense to me. Are you trying to say that at todays pixel densities > (6-14Mp APS sized sensors) that the lens resolution doesnt matter > and going to a smaller physical sized sensor via cropping and higher > density sensor will not lower > image resolution if you use a shorter FL lens of same quality? I say > it WILL lower image quality because the lens resolution in absolute > lines per millimeter is nowhere near the point where it isnt affecting > final system resolution. Maybe if we were using 640x480 sensors > it wouldnt matter, but not now, the lens IS affecting final image > resolution even the best ones. Only if it had INFINATE resolution > would it have zero effect when you used shorter lens/cropped sensor > combination. i.e. using a shorter lens and cropping a 14mP sensor image > wont be as good as using a longer lens and NOT cropping a 10mP sensor > image. > > JC OCONNELL > [EMAIL PROTECTED] > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jos > from Holland > Sent: Saturday, June 28, 2008 2:33 PM > To: Pentax-Discuss Mail List > Subject: Re: Sensor resolution V focal length.......... > > > On top: > if lens resolution (number of line per mm) is in same order of magnitude > as the number of pixels / mm on the sensor. The lens has the huge > advantage the the lines can be at any place even diagonally, but the > pixels have discrete position making the pixels/mm much less effective, > this leads to at least 50% advantage for the lens resolution..... > > On Top: "10 Mpixels" does not mean 10Mp for BLU or RED not even for Green > > Exact theoreticle comparison of lens resolution and pixel density is > hard and will be very much picture content dependent > > Greetz Jos > > J. C. O'Connell wrote: > >> THE PROBLEM IS THAT AT CURRENT PIXEL DENSITIES OF THE SENSORS (fairly >> high >> relative to lens resolutions), >> THE LENS'S RESOLUTION IS STILL A MAJOR FACTOR OF TOTAL SYSTEM RESOLUTION. >> >> > > -- 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.
