| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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I don't think you can 'cheat' by using the focal length multiplier of 1.5, which is only intended to give a guide to the field of coverage provided by a given focal length on a DX body compared with the field of view of the same focal length on an FX or 35mm film body. I am sure the parameters of the calculation are completely different.
Simple way to check, with a DoF calculator change the format to DX and the focal length to X1.5 and compare the results?
Which calculator are you using?
JK is right, the smaller the sensor the greater the DoF. That's why tiny format camera's don't need focus and P&S cameras have such great DoF. Small format movie cameras also have the same characteristic.
On the other hand large format cameras need careful focusing even for distant subjects.
*Not sure where that is measured to? Not critical for landscapes but for extreme close-up's it becomes very important. Most cameras have the focal plane marked but not the lens datum, perhaps because it moves during focus on IF lenses?
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Robert.