arry Super Spammer
Joined: 03 Jan 2009 Karma :
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killa Won't Shut Up
Joined: 18 Oct 2004 Karma :
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Posted: 10:00 - 12 Apr 2017 Post subject: |
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Ok so I’m getting to know my way around some of the cameras and the functionality now. Thanks for all the input by the way.
I have some questions now. Some people mention the sensor in listings, saying ‘the sensor has been cleaned’ what are they talking about? Also with a second hand body it seems to be worth knowing just how many times the cameras aperture has been shut (shutter count).
As for the MP count. Does this simply affect how much you can zoom into a photo, once it is on your PC? ____________________ Cleverly disguised as a responsible adult.
Bike:- Yamaha TRX850 | Killas Biking History | Killas Gaming History | Killas autmotive history |
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Going Nearly there...
Joined: 26 Feb 2012 Karma :
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Kickstart The Oracle
Joined: 04 Feb 2002 Karma :
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Posted: 23:17 - 12 Apr 2017 Post subject: |
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Hi
The sensors get dirty and a tiny piece of dirt can show up on the image. How much will depend on aperture (they are REALLY obvious if you drill a tiny hole in a body cap and use it as a pinhole camera). Newer models tend to have a sensor cleaning mechanism when the camera is turned on.
Shutter actuations is important. From memory the estimated life of the consumer Canon dSLR (ie, 350D) was 50K actuations, the prosumer Canon dSRL (ie, 20D) was 100k actuations and for the professional bodies (ie, 1D) it was 200k actuations. A new shutter is not cheap, even if Canon will still supply the parts. My 1D had a new shutter at 188k actuations, although probably didn't need it I was being paranoid and decided to get it done as it was close to life expectancy. The replacement has died with minimal use (well under 30k).
MP is the number of pixels. But those pixels are also smaller, and quite possibly less defined as the lenses are less able to control the image accurately enough. You can zoom in a touch more probably, but it is not a good option compared to framing the shot correctly in the first place. Also remember that the mp count increases rapidly as it is the result of multiplying the vertical and horizontal resolutions. So 8.6mp is an image of 3600 pixels x 2400 pixels. 15.3mp sounds a lot bigger but is only an increase to 4800 pixels x 3200 pixels
All the best
Katy ____________________ Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing |
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