A simple technique used that worked 95% of the time for me is
multiplying the effective focal length of your lens against the crop factor of
your camera.
Table for Canon cameras.
| 
Model | 
FOVCF | 
Pixels/Megapixels | 
Viewfinder | 
DLA* | |||
| 
1.9x | 
4352 x 3264 | 
14.3 | 
f/6.9 | ||||
| 
Canon PowerShot G12 | 
4.7x | 
3648 x 2048 | 
10.0 | 
f/4.3 | |||
| 
Canon PowerShot G9 | 
4.7x | 
4000 x 3000 | 
12.1 | 
f/4.0 | |||
| 
1.6x | 
5184 x 3456 | 
18.0 | 
f/6.8 | ||||
| 
1.6x | 
5184 x 3456 | 
18.0 | 
 .85x | 
95% | 
f/6.8 | ||
| 
1.6x | 
5184 x 3456 | 
18.0 | 
 .85x | 
95% | 
f/6.8 | ||
| 
1.6x | 
5184 x 3456 | 
18.0 | 
 .87x | 
95% | 
f/6.8 | ||
| 
1.6x | 
4752 x 3168 | 
15.1 | 
 .87x | 
95% | 
f/7.5 | ||
| 
1.6x | 
4272 x 2848 | 
12.0 | 
 .85x | 
95% | 
f/8.3 | ||
| 
1.6x | 
4272 x 2848 | 
12.2 | 
 .87x | 
95% | 
f/8.3 | ||
| 
1.6x | 
3888 x 2592 | 
10.1 | 
 .81x | 
95% | 
f/9.1 | ||
| 
1.6x | 
3888 x 2592 | 
10.1 | 
 .80x | 
95% | 
f/9.1 | ||
| 
1.6x | 
3456 x 2304 | 
8.0 | 
 .80x | 
95% | 
f/10.2 | ||
| 
1.6x | 
3088 x 2056 | 
6.3 | 
 .80x | 
95% | 
f/11.8 | ||
| 
1.6x | 
5184 x 3456 | 
18.0 | 
 .95x | 
96% | 
f/6.9 | ||
| 
1.6x | 
4752 x 3168 | 
15.1 | 
 .95x | 
95% | 
f/7.5 | ||
| 
1.6x | 
3888 x 2592 | 
10.1 | 
 .95x | 
95% | 
f/9.1 | ||
| 
1.6x | 
3504 x 2336 | 
8.2 | 
 .90x | 
95% | 
f/10.2 | ||
| 
1.6x | 
3504 x 2336 | 
8.2 | 
 .90x | 
95% | 
f/10.2 | ||
| 
1.6x | 
3088 x 2056 | 
6.3 | 
 .88x | 
95% | 
f/11.8 | ||
| 
1.6x | 
5184 x 3456 | 
18.0 | 
 1.0x | 
100% | 
f/6.9 | ||
| 
1.0x | 
5472 x 3648 | 
20.2 | 
 .71x | 
97% | 
f/10.5 | ||
| 
1.0x | 
5760 x 3840 | 
22.3 | 
 .71x | 
100% | 
f/10.1 | ||
| 
1.0x | 
5616 x 3744 | 
21.1 | 
 .71x | 
98% | 
f/10.2 | ||
| 
1.0x | 
4368 x 2912 | 
12.8 | 
 .71x | 
96% | 
f/13.2 | ||
| 
1.0x | 
5184 x 3456 | 
18.1 | 
 .76x | 
100% | 
f/11.0 | ||
| 
1.3x | 
4896 x 3264 | 
16.1 | 
 .76x | 
100% | 
f/9.1 | ||
| 
1.3x | 
3888 x 2592 | 
10.1 | 
 .76x | 
100% | 
f/11.5 | ||
| 
1.3x | 
3520 x 2336 | 
8.2 | 
 .72x | 
100% | 
f/13.2 | ||
| 
1.3x | 
3520 x 2336 | 
8.2 | 
 .72x | 
100% | 
f/13.2 | ||
| 
1.0x | 
5632 x 3750 | 
21.1 | 
 .76x | 
100% | 
f/10.2 | ||
| 
1.0x | 
4992 x 3328 | 
16.6 | 
 .70x | 
100% | 
f/11.5 | ||
Example:
Im using a Canon lens 17-40mm L (no Image Stabilizer) and with a
Canon EOS 60d DSLR with a camera crop factor of 1.6 (see table above) so by getting the effective focal
length of my lens e.g. 40mm (maximum focal length) X 1.6 (my camera crop factor) = 64,
so my minimum shutter speed will be 1/64s.
The formula is Focal length of your lens X crop
factor of your camera = The minimum shutter speed you will use.  Try it!!!!
 
 
 
 
 
 
 
 
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