Canon Line Offset Noise

Started Oct 20, 2009 | Discussions thread
OP John Sheehy Forum Pro • Posts: 22,811
Re: suggest a separate tech forum

on2art wrote:

Yes, I am very thankful for the generosity of the more technically astute as seen in various forums.

Their on going contribution helps to dispel so much wrong thinking that actually appears to be somewhat exploited by manufacturers in the marketing of digital cameras. Today I was at a popular well known camera store and the sales people were convinced that noise of any sort correlates directly to pixel density.

Of course, the only way in which the banding noise of the 7D at low ISOs could be related to pixel density is a combination effect with the burst speed. If it takes too long to correct the banding (or the system would have to be slowed to avoid it), then the density could be said to play a role, but it seems that the necessary math is done anyway, so the variables may just need to be made more precise.

It is more than a little exasperating to find how passionate they are at telling their little stories about how the G11 is so much better than the G10 because Canon "wisely upgraded" to a lower pixel count for that approximately 2/3" size of sensor found in many better compacts but passionate story telling sells cameras, yes.

Yeah, well the 5D2 gave the lowest high-ISO read noise per unit of sensor area with its slightly larger pixels when it came out, but it looks like the 7D has caught up to it in statistical quantity, and improved upon it in character, with Canon's smallest DSLR pixels yet. The full-frame images from my 7D at ISO 12800 resampled to a 1440*1050 screen slay those from my 5D2, unless they are high-key! At lower ISOs that are more shot-noise affected, the 5D2 should still be a bit better (and use more of the lens' resolving power, although I was getting aliasing last night with my 7D and 70-200 f/4L IS - showing that even for a good zoom, 18MP is nowhere near the practical limit).

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John

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