|Quoting egondo (Reply 5):|
Will it apply for subjects longer than 100m as mentioned?
The closer the subject, the steadier the hand can generally hold the camera - although this theory can also depend on the size of the subject. The more you zoom in, the greater impact movements of the camera/lens will have on the sharpness of the image.
Sometimes you have to make sacrifices and trade-offs to get a sharp image. Aperture f/8 is generally a good choice but if you can't get a sufficient shutter speed it's fine to drop it by a couple of stops to f/7.1 or 6.3; so long as the required depth-of-field can still be achieved (if it's relevant). Another trick is to increase the ISO (sensitivity), but this of course leads to increased noise in the image.
The final solution is to turn the optical stabilisation on - but of course you have to have this feature in the first place!
As a quick guide, I aim for the following shutter speeds (without stabilisation):
1) Taxiing or slow moving aircraft:
a) up to 200mm = at least 1/250th
b) over 200mm = at least 1/320th
c) over 300mm = at least 1/400th
2) Rotating/arriving aircraft:
a) up to 200mm = at least 1/400th
b) over 200mm = at least 1/500th
c) over 300mm = at least 1/640th
Hope this helps.