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Hi Chris. Exposure time depends on a lot of variables, damn that's bright for 1/4 sec's. That STI is really sensitive!
Looks a little over exposed and out of focus. A 3x barlow makes getting this right, difficult to do. Depends on the native FL of the scope. A 3x on an F4...yeah should be ok but a 3X on a F8~F10, stretching the limits and you will need very clean & still air for this.
The only way to tell is to review your subs as you take them and adjust from there.
Combining subs from slightly underexposed images will brighten the final image and you can manipulate the brightness etc but it's much harder to reverse this on an over exposed image.
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