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Larger image sensor=better pic quality?
Old 06-13-2005, 08:09 PM   #1 (permalink)
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I am trying to decide between 2 cameras right now. The Digital Rebel 300D or the Minolta A200. Although the Minolta is 8 megapixels vs the Canon's 6.3, the image sensor in the Minolta is only 8.8x6.6mm while the sensor in the D-Reb is 21.6x15.1

So...does this mean the D-Reb will take better, sharper photos eventhough it has fewer megapixels? or will the Minolta with a CCD (insted of a CMOS) sensor and more megapixels have the advantage? Thanks.
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Re: Larger image sensor=better pic quality?
Old 06-13-2005, 08:23 PM   #2 (permalink)
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I could have sworn we've had this conversation before.

Short answer...Digital SLR better. Even if it's only a D30.
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Re: Larger image sensor=better pic quality?
Old 06-14-2005, 01:09 AM   #3 (permalink)
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The larger sensor is more sensitive to light. One pixel in the Rebel sensor is about 4 times larger than a pixel in the A200 sensor. Larger means more light hits the pixel. More light means less amplification of the signal. Less amplification means less electronic noise. Less noise means cleaner capture. Photographs taken with the Rebel set at ISO 400 will most likely look much cleaner than photographs taken by the Minolta at ISO 100. And the Rebel-photos shot at ASA 1600 will certainly look cleaner than A200 photos shot at ASA 400.

As far as sharpness goes, that's as much a function of the lens as the sensor, and the glass available for the Rebel is top notch. Not sure about the lens quality on the A200, but it's probably at least decent.

Another thing to consider is response. The Rebel is going to be much faster. It will focus faster, trip the shutter faster, and write to media faster. The Rebel will be a whole lot less frustrating to use.

The bottom line is that the increased resolution (8 vs. 6.3) isn't enough to compensate for the size of the sensor. But try them for yourself. Take a compact flash card to a dealer that has both cameras and take some shots with each camera. Use different ASA settings, focal lengths, etc. Then take the card home, dump the images to your computer, and see which camera takes better images.

-Chip
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Re: Larger image sensor=better pic quality?
Old 06-14-2005, 11:17 AM   #4 (permalink)
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Do not buy the Minolta-It is a waste of money. Buy the SLR.
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Small sensors are crap, but not for the reasons you think.
Old 06-21-2005, 08:12 PM   #5 (permalink)
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Small sensors are crap, but not for the reasons you think. They mean you are using short focal length lenses all the time, that have really deep DOF, and they require higher resolving power of the optics to get sharp pictures.

Think of it this way, would you want to enlarge a smaller-than-postage-stamp-sized portion of a 35mm negative up to an 8x10 print, or a full-frame portion of a negative up to that size? Even if you have film of infinate recording ability, the limits of the resolving power of the lens are reached much more quickly with the smaller sensor.
 
 
Re: Larger image sensor=better pic quality?
Old 06-21-2005, 09:23 PM   #6 (permalink)
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You will never ever ever be able to take a picture even remotely like this with that Minolta "Toy" camera.. RBP knows what he is talking about.. those tiny sensors are crap.

JP

Picture taken with a camera that has the same chip that was used in the 300D, 6.3MP,...plus with a 135mm f2.0 Lens @ f2.0
 
 
Re: Larger image sensor=better pic quality?
Old 07-02-2005, 01:46 AM   #7 (permalink)
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Thanks for all the help, it really made me think twice about the Minolta. I ended up with the D-REB 350D, just arrived today [img]/ubbthreads/images/graemlins/laugh.gif[/img]
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