Great link Rob.
unfortunately, this bit could be a little misleading....
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In fact for Canon APS-C sensors, 1.6x sharper. So instead of allowing the image to move by 16 microns, we can only allow it to move by 10 microns. Since we can only allow 10 microns of image movement, we now need to use a shutter speed of 1/160s rather than 1/100s. So smaller formats need faster shutter speeds if we want equally sharp prints of the same size.
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This might leave people to beleive that a faster speed is needed for DX/ APS-C crop sensors verses FX/ Full frame (or 35mm) cameras. If the same lens is used this is true...which is what is said here. However,try a 30mm lens (or approx 30mm set on a zoom) on a DX /APS-C crop camera, and a 50mm on an FX /full frame (or 35mm film) camera to make more worthwhile 'real world' comparisons.
Many people will have experienced 35mm film SLR verses the C-APS sized DSLR. Others will have experienced larger formats than 35mm vs C-APS.
Even forgetting that larger than 35mm format cameras tend to be larger and heavier than most popular APS-C crop DSLRs, so promoting hand strain/shakes etc....with a given angle ie what you want to include in your shot , the reverse of the above is actually true.
To try and make this easier to understand, it's easier to think of the time verses physical distance the shutter blades have to move with any given camera format.
I've frequently had people say to me that they can handhold their APS-C 1.6x crop DSLR at anything approaching 1/8th second with a standard zoom lens, and still get sharp enough pictures.....OK, so try doing this with a 35mm SLR. You'll find the success rate to be much lower!
Alternatively, try handholding a 2x crop Olympus DSLR...wow!...you can get away with murder! LOL....some of the 'bridge' hybrid cameras have even smaller sensors, so even lower is possible
Those lucky enough to also own a 'full frame' FX crop DSLR can try the same against their 'C-APS' DX crop DSLR.
In an effort to explain further;
we have 3x cameras
1x 35mm or full frame camera with a 50mm lens
1x APS-C 1.6x crop camera with a 30mm lens
1x 2x crop camera with a 25mm lens
All three have approx' same angle of view (for arguments sake..ok, the ratio is different etc etc)
Set them all at the same low shutter speed
Normally on average the results from a full frame camera are going to show more blurr than the 1.6x crop. On average the 2x crop will have the best 'sharpness rate'.
That said, you can't go shooting at a couple of seconds with a minature camera....likewise a large format plate camera doesn't need a millionth of a second to get a blurr free image. Shutter speed x sharpness. There's probably a success rate curve there somewhere!...it's not going to be linear at the extremes.
DX/APS-C has a massive advantage getting sharp shots at slow speeds with a given image size/ angle required vs 35mm/full frame....another reason why I've been liking my digi Nikons verses my old film cameras so much
If you don't beleive me try it out
Does this make sense, or is this totally confusing??
