Attempted astro with eos m + 22mm lens but frame flashed red and won't take shot

Started 10 months ago | Questions thread
bobkoure Senior Member • Posts: 1,574
Re: 3 + 3 + 3

PhotoTeach2 wrote:

bobkoure wrote:

PhotoTeach2 wrote:

Astro must be done in manual mode, (both exposure and focus).

Typical exposures are ISO-3200 @ f/2.8(3) @ 30-seconds. (I remember it as 3+3+3)

But since longer than 15-seconds can show "trails", I suggest using f/2 lens or ISO-6400 @ 15-seconds.

If you don't have a dual-mode sensor, like the D850, and are shooting in RAW, why bother raising ISO? Read noise?

I said "or" .... another choice is f/1.2 - 1.4 and then can even "lower" ISO, (below 3200).

The 3+3+3 is just any easy way to remember a "basic" exposure, (like Sunny-16 or Loony-11).

I realize that I'd have had better luck focusing if I boosted ISO for that.  My point with ISO is that for a lot of cameras these days, it's just a gamma adjustment.  I normally leave ISO Auto on, but I'd had it off for that test shot. Time to experiment

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