[filmscanners] RE: film and scanning vs digital photography

["Hanna, Mark (x9085)" <Mark.Hanna@crowncastle.com>]

This makes good sense Art, however I'm curious about pixel density.
(apart from the obvious larger pixel = more photons landing in it
sensitivity advantage which is often the case with the larger sensor)

Can the lenses being used on the cameras in question, satisfactorily
resolve the number of lines per mm required for the smaller pixel
density of the smaller sensor? 

I have read about lenses having 40LPmm (crap consumer zoom)or 100LPmm
(reasonably good lens), is this figure in relation to the intended
projected plane? If so, 40LPmm for a 35mm film plane or FF sensor would
be 24mm by 36mm which at 40LPmm, equals 1.3824 MPixels. 100LPmm =
8.64MP. 

For an APSC sized sensor, 15 by 24mm I think, you're looking at 0.576MP
and 3.6MP for 40LPmm and 100LPmm respectively.

So in theory, you may be able to crop the FF pic to emulate a 1.3 or 1.6
sized sensor, and despite possibly having less pixel density, the sensor
may be capturing the same actual sharpness or resolution, in which case
you could simply upsize the resolution to match in PS, and get the same
resolution, same sharpness, but lower noise photograph, due to larger
pixels, but pixels that may actually match the resolution of the lenses
better than the smaller sensor. 

I don't know much about lens resolution, however if the average L series
lens is around 100 to 120LPmm, I know I'd be wanting the larger sensor
if my above assumptions are correct. I have a 5D, and the size and
resolution of the images never fail to amaze me, as good as my old
Mamiya M6451000S. 

 

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk] On Behalf Of Arthur Entlich
Sent: Wednesday, 11 July 2007 9:47 AM
To: Hanna, Mark (x9085)
Subject: [filmscanners] Re: film and scanning vs digital photography

Let's say you have two sensors, each 12 MP.  One is FF the other smaller
using 1.3X factor. To get the same multiplication factor with the FF,
you have crop  about 1/4th of the area out, which means you have reduced
the resolution by that much.  If the FF is about 1/4th higher res to the
smaller sensor, then you are correct, no disadvantage.

Considering cost and weight of a FF, may not be as great an advantage as
it first appears.

Art

gary wrote:

>I simply see no advantage to have a smaller sensor. I don't see how I
>spent pixels. This makes no sense to me.
>
>Nikon has an option on some models where you can toss the outer area of
>the sensor to save space on the memory card.
>
>R. Jackson wrote:
>
>
>>Sure, but you "spend" pixels of your total sensor resolution to get
>>there.
>>
>>On Jul 10, 2007, at 9:37 AM, gary wrote:
>>
>>
>>
>>>A cropped sensor really doesn't give you more reach. If you think
>>>about
>>>it, you could just crop a full size image to get more "reach."
>>>
>>>
>>
>>
>>
>
>
>

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