Quote:
Originally Posted by JA
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* Actually thinking on it further, you had a 0.65 reducer in there in your image, so removing it in future you'd loose ~1EV and also if using the 2X TC you'd loose another 2EV, so your original exposure time of ~1/15 th of a second (63.5ms) may be OK as it would certainly be dimmer (1/8th the light per unit area compared with your original setup) and may help overcome the oversaturation issue you raised. Perhaps even 1/8 th or 1/4 sec or bracket the exposures. Have fun.
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Exactly right !
Over weekend I tried the C11 prime focus with IMX291, and results are discouraging.. nebula was considerably dimmer (because its image was larger), but eta was blazing with the same intensity, so FR was a good (unintentional) choice for this combination.
However - 4 years ago I did
eta with C11+2X teleconverter+Canon60D.
60D (now it is modified) is obviously better camera
I think the better approach for object like this (bright central star, dim nebula nearby) would be some sort of shade for central star (coronograph).. something Rolf Olsen used for his
Beta Pictoris dust ring observation back in '11.