Imaging Conditions : > WebCam Philips VestaPro modified (version 1) equipped with B&W sensor SONY ICX098BL on my 8" Celestron + 3.3 Meade Reductor + Celestron LPR Filter . Checking of the telescope's collimation on Betelgeuse, focused by the aigrette method. Capture of 94 40s individual frames. Note: for the treatment 2 images were eliminated... Parameters of acquisition: Gain 70%, Gamma 50%. Here is one of the 94 rough images - Reduced to 80% > Obscure nebula is perceptible on this individual frame. Acquisition of 11 darks, telescope closed. Acquisition of 11 ULP by pointing the orange horizon, the telescope being closed by a white translucent bag. Rem: The use of LPR filter is undoubtedly for much in the success of this attempt. Indeed, by reducing the parasitic radiation of urban lighting, I could increase the exposure time and thus appreciably improve the signal report/ratio on noise of each rough image... |