Exposure settings on 10D

[yalemba]

Last evening, my Sekonic L358 recommended the following exposure settings: Aperture = 4 2/10 and Shutter 1/8.

How do I set the 4.2 aperture on my 10D? :shock:

[Morden]

I don't believe that you can! Even using 1/3 stops, you can't set 4.2 (or, at least, I can't!).

Edit:
On my 10D, setting Custom Function 06 to 1 (1/3 stop increments instead of 1/2 stop) seems to have no effect on aperture value selection! It does affect shutter speed selection. What's going on there?

Edit:
Oops! Yes it does affect aperture settings. It's just that some increments are identical, whether using 1/2 stop or 1/3 stop. Still no 4.2 though!

[PacAce]

Last evening, my Sekonic L358 recommended the following exposure settings: Aperture = 4 2/10 and Shutter 1/8.

How do I set the 4.2 aperture on my 10D? :shock:

Use f/4. You don't HAVE to be exact with these readings, just close enough.

[scottbergerphoto]

Great meter. I used it for a year with my G2 and studio lights and now with my 10D. I recently added the L558 to get built in spot metering.
Scott

[Vegas Poboy]

Make sure you have the correct settings & functions on the
L358. The Camera and light meter f/stop settings should be the same, either 1/3 or 1/2 and the speed. Check the manual for the dip switch settings. Then adjust your speed or F/stop as close as possible.

[DaveG]

Last evening, my Sekonic L358 recommended the following exposure settings: Aperture = 4 2/10 and Shutter 1/8.

How do I set the 4.2 aperture on my 10D? :shock:

As everyone else will point out you can't use .2 of a stop since .3333 is a third of a stop, and as close as the 10D will get you.

Even if you could get to .2, the error in the way your aperture really closes down; or the inaccuracy of the shutterspeed - or with film the true ISO - all will create an error more than .2 of a stop. Sometimes they cancel out but sometimes they don't. In most cases they are beyond what I would consider to be a "significant decimal place" so the error is small enough to be ignored.

But what this "over" accuracy is good for is when you are setting up lighting, especially for copying. If I was trying to set up a couple of lights to copy a painting I'd want even light over the entire thing. I'd move the meter around while keeping an eye on that two tenths. I'd ideally want no variation at all. After you actually take the picture it won't matter if you are .2 of a stop off as long as it's .2 all over.