Reply #6: I can think of two basic must-knows

[Oeditpus Rex]

The rule of reciprocity — If you're shooting with manual exposure (not just manual focus), you need to know the relationship between aperture (f-stop) and shutter speed. Reciprocity tells us that if one is changed, the other changes inversely.

Let's say you set the shutter speed at 1/250th of a second and the light meter tells you the aperture for a proper general exposure at that speed is f8. It's important to know that if you increase the shutter speed to 1/500th, the aperture must be opened one stop, to f5.6, to get the same exposure. If you decrease the speed to 1/125th, you must close the aperture one stop to f11. (A lower aperture number means a wider lens opening.)


Depth of field — There are two basic things to remember about how much of your photo will be in focus from front to back:

•A larger aperture (lower numerical f-stop) yields less depth of field; smaller yields greater.

•Wide-angle lenses yield the greatest depth of field, and depth of field decreases as lens focal length increases.



PM me if you have any questions. :hi: