Klipsen

Probably the most common use for it I actually had the user manual for my flash meter in mind when I answered, but then my mind strayed ...

When you take multiple exposures on a single frame, you need to know how much light the combined exposure will be: http://farm3.staticflickr.com/2469/3618332517_2f29a2a208_z.jpg

Taking one picture is fast. Taking pictures at five or more f-stops and then comparing them to see which is the most pleasing can be time consuming. Instead, you push the stop-down button, play...

... many modern lenses use internal focusing, which means the focal length changes as you focus, so you need to know the true focal length for a certain focus distance in order to get the correct...

Actually, that's exactly what happens: Picture 1 close up at 28 mm. Picture 2 as far away as I could go and zoomed to make the mouse and alarm clock the same size as in the first picture. Note...

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... according to their home page: http://www.sirui-photo.us/Sirui/Sirui-M-Tripod-Series.html   I suppose the 'X' stands for "extendable".

May I suggest that you read your own comment ... all of it. Now, if you had written: "Otherwise, my understanding is that for AF SLRs you need a Circular Polarizer ...", you would have been...

You made the split between digital and non-digital (i.e. film), not between AF SLR and non-AF/non-SLR. With on-sensor AF, both types of polariser should work, although SLTs may present a problem.

Wrong. It's very easy to scratch the front lens.   Obviously, the filter will not stop a hammer, or prevent internal damage resulting from a fall onto concrete. That's not its purpose, though....

Following advice like that nearly cost me a 24-70 mm f/2.8 lens. Fortunately the damage is near the edge of the front lens and not a scratch, but rather a small smudge. It could have been much...

Polarising filters will most often be used against reflections off water, i.e. horizontal surfaces, thus effectively blocking the light rays that the AF modules were supposed to receive via the...

The D-ring screws are shorter.

Manfrotto's own similar D-ring screws for their smaller QR plates are longer than the slotted screws for the larger plates - about 1 mm, I would say. Make sure you get one that has the right...

It's "peaking" and it uses contrast to decide which parts of a subject are in focus. Invariably, even the sharpest border between black and white will become blurred when it's not in the focus...

Faces near corners (and edges for that matter) tend to get "distorted" if extreme wideangle lenses are used - and, paradoxically, all the more so if the lens has little distortion.    Precisely....

In absolute terms, that's true. That certainly depends. Yes ... at their minimum focusing distance. That can mean one hell of a difference. If you can only go so close, the 105 mm may have a...

Their "Odin" is full TTL, and there are other - even more affordable - alternatives, if you don't need TTL.

It can be done, but requires software: http://forums.cnet.com/7723-21564_102-547699/can-i-recover-data-from-a-mac-hard-drive-to-a-pc/ You could also download a Linux, e.g. Ubuntu, that can be run...

Spot meters require some experience, unless you have an 18 % grey card to measure off. An incident meter isn't always practical, but when it can be used, results are closer to what your eye sees...