I don't think its fair make the comparison with anything but equal quality lenses across the entire formats. if you start to allow for different lens quality then you arent comparing sensors youre comparing camera systems. My comments were with regard to sensor size only and assumed equal quality lenses. jco
-----Original Message----- From: P. J. Alling [mailto:[EMAIL PROTECTED] Sent: Tuesday, January 10, 2006 8:04 PM To: pentax-discuss@pdml.net Subject: Re: Pentax lens test on DIGITAL? All Pentax DSLR same imagaing? Could be that a lot of Canon lenses have lousy edge edge performance... That would be a moot point with an APS sized sensor. Ivan Shukster wrote: >Last week I read on the web a comparison of the Canon Lot of Money or >whatever that model is called and the Nikon D2X and the result was for >some things the Nikon bettered the Canon that had a larger sensor and >more megapixels and in other aspects the Canon was the better of the >two. Looked at it at a different computer so do not have a link but the >photographers were in Norway and one had just bought the D2X and his >friend owned the Canon IIRC. > >-----Original Message----- >From: J. C. O'Connell [mailto:[EMAIL PROTECTED] >Sent: January 10, 2006 5:37 PM >To: pentax-discuss@pdml.net >Subject: RE: Pentax lens test on DIGITAL? All Pentax DSLR same >imagaing? > > >I think the answer is very simple. If you keep the >Mpixels of a digital sensor constant, the larger >the sensor the higher the quality of the image. >Two reasons, 1. the individual pixels are larger, >and thus lower noise. 2. The lenses are never >infinite resolution so by making the image circle >bigger ( for the bigger sensor ) more image information >is resolved to be recorded too. Better recording >and better image to be recorded. That's got to >be better...How could a larger sensor NOT improve >image quality. ( ignoring camera/ lens handling issues, etc. ) jco > >-----Original Message----- >From: John Forbes [mailto:[EMAIL PROTECTED] >Sent: Tuesday, January 10, 2006 4:53 PM >To: pentax-discuss@pdml.net >Subject: Re: Pentax lens test on DIGITAL? All Pentax DSLR same >imagaing? > > >First of all, Godfrey, this IS a digital versus film thread. Your >thought experiment is a diversion. > >Dealing first with my assertion, common sense tells us that if we have >to enlarge a negative/image more, it will look less sharp. So let's >move on. > >Dealing with your scenario, which was: > >Let's assume that we have two cameras with digital sensors with 8Mpixel >resolution, one sized to 16x24mm and one sized to 24x36mm. > >Further, let's assume that that we have a 35mm lens and a 50mm lens >which demonstrate exactly equal performance. > >Fit the 24x36mm camera with a 50mm lens, fit the 16x24mm camera with >the 35mm lens. Then take a photograph of the same subject with each of >the two cameras, framed and exposed identically, to RAW format files. >Process them for identical tonal rendering. Do not apply any >sharpening. Print them to 10x15 inch image area on 11x17" paper. > >Which one will look sharper and why? > > >My answer: > >If we assume that the limiting factor is lens resolution (which it >usually is in my experience) then the print from the 50mm lens will be >sharper. It will need to be enlarged less. > >However, my experience does not include 24x36 sensors. A sensor of >this size with only 8Mpixels will perhaps itself be the limiting >factor, and therefore there might not be much or any difference. > >However, I should be most interested to hear both your theories and of >your practical experience. > >John > > > > > > > > > > >On Tue, 10 Jan 2006 01:10:25 -0000, Godfrey DiGiorgi <[EMAIL PROTECTED]> >wrote: > > > >>I said nothing about 35mm film in my thought experiment, John. >>Although I disagree with you there too, from personal experience >>making 10x15 and larger prints from both 35mm film and 6-8Mpixel >>digital captures. But I'll leave that for another digital vs film >>thread. >> >>I said two cameras, one with a 8Mpixel sensor of 24x36mm dimension and >>one with 8Mpixel sensor of 16x24mm dimension. Sensors equal digital >>cameras, not film. >> >>Godfrey >> >>On Jan 9, 2006, at 4:44 PM, John Forbes wrote: >> >> >> >>>Godfrey, >>> >>>All else being equal, the 35mm will look sharper. Assuming both >>>media are able to do justice to each lens, and that each lens is able >>>to resolve N lpmm, and that the 35mm lens will fill the frame as much >>>as the 50mm (it's too late for me to work that out), the 35mm image >>>will need less enlargement. >>> >>>John >>> >>>--Using Opera's revolutionary e-mail client: http://www.opera.com/m2/ >>> >>> >>> >> >> >> >> >> > > > >-- >Using Opera's revolutionary e-mail client: http://www.opera.com/m2/ > > > > >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.1.362 / Virus Database: 267.14.14/222 - Release Date: >05/01/2006 > > > > > -- When you're worried or in doubt, Run in circles, (scream and shout).
