Re: Colorsync-users Digest, Vol 2, Issue 507 -Filtering
Re: Colorsync-users Digest, Vol 2, Issue 507 -Filtering
- Subject: Re: Colorsync-users Digest, Vol 2, Issue 507 -Filtering
- From: Robin Myers <email@hidden>
- Date: Thu, 22 Dec 2005 14:52:43 -0800
Herr Steib,
On Dec 22, 2005, at 14:09, Stefan Steib wrote:
Nathan and Robin
I´m talking of Photography and not snapshot taking.
So am I.
If you want to do sports or people go without filter and do not care
about the noise.
Any time you put a filter into the optical path the signal is decreased
by the spectral transmittance of the filter. Thus, the digital sensor
must increase the exposure, either by increasing the analog gain, the
digital gain, changing the shutter speed, or increasing the aperture
opening. All of these changes degrade the image by some amount. Whether
the degradation is acceptable to the photographer depends on the
desired result. Noise will be increased by changing the analog or
digital gain, quantization may also occur with increasing the digital
gain, increasing the exposure time (shutter speed) may produce more
blurring in moving objects and produce more dark current noise, opening
the aperture will reduce depth of field.
If you have to fullfill quality photography (and this was the original
Question because using a Leaf Aptus or a Phase One 25 meg chip
freehand for reportages
seems a bit "exotic" to me, but what do I know.....) and you need to
catch any bit of information and color which is there,
I would propose you remember another glorious invention of our
forefathers - a tripod.
Although I have seen some interieur Photographers or industry guys go
berzerk during their work on location, I have never seen anyone of
those
using Automatic exposure shooting their 20+ Mpixel backs.............
I don´t know how guys do this over there in the US, well..... I
wouldn´t do it...................<G>
I know these wratten filters are so heavy and bulky, it´s a real
nuisance to carry another 10 gramms with my 150 kilos of highend
Camera stuff.
I understand that fullheartedly........<G>. (BTW - do you remember
that putting a wratten on the back of a lens is nearly like a free
lunch...???)
The laws of physics did not change with the advent of digital
photography. When shooting film with filters there were tables of
filter factors that were applied to the exposure to compensate for the
reduction in light.
<snip>
Robin Myers
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