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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