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

Started 10 months ago | Questions thread
PhotoTeach2 Senior Member • Posts: 9,440
Re: 3 + 3 + 3

bobkoure wrote:

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

"Auto" ISO, (or any "auto" exposure mode), is not good for night sky because it will "lighten" it to an (18%) gray.

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