08-13-2010, 09:41 PM
[quote name='Yakim' timestamp='1281703072' post='1741']
With all due respect, I seriously doubt that.
[url="http://photo.net/canon-eos-digital-camera-forum/00Wuji"]http://photo.net/can...ra-forum/00Wuji[/url]
[/quote]
The concept is simple: at 1:1 the area of the image circle the lens projects is 4X the size of the image circle at 1:1. Provided lighting is constant, at the same aperture the loss of light is therefore equal to 75%, as the same amount or light is shared over four times the area. IOW, th ecropped image used for the 1:1 shot on yoru sensor, now only recieves 1/4 odf th elight the sensor received at infinity., or a loss of 2 stops of light.
It is a simple, physical given, i.e., it's a law of physics. Optics 101.
If you therefore get different results with different lenses, their has to be something different at play, no more, no less.
Kind regards, Wim
With all due respect, I seriously doubt that.
[url="http://photo.net/canon-eos-digital-camera-forum/00Wuji"]http://photo.net/can...ra-forum/00Wuji[/url]
[/quote]
The concept is simple: at 1:1 the area of the image circle the lens projects is 4X the size of the image circle at 1:1. Provided lighting is constant, at the same aperture the loss of light is therefore equal to 75%, as the same amount or light is shared over four times the area. IOW, th ecropped image used for the 1:1 shot on yoru sensor, now only recieves 1/4 odf th elight the sensor received at infinity., or a loss of 2 stops of light.
It is a simple, physical given, i.e., it's a law of physics. Optics 101.
If you therefore get different results with different lenses, their has to be something different at play, no more, no less.
Kind regards, Wim
Gear: Canon EOS R with 3 primes and 2 zooms, 4 EF-R adapters, Canon EOS 5 (analog), 9 Canon EF primes, a lone Canon EF zoom, 2 extenders, 2 converters, tubes; Olympus OM-D 1 Mk II & Pen F with 12 primes, 6 zooms, and 3 Metabones EF-MFT adapters ....