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Hello, I just registered myself to Astrobin and started looking through great images! Hope this is the right forum to ask my questions... I not only just enjoy the images but also want to know/see the quality of the images taken by some combinations of equipment that I'm interested in buying in the future. In particular, I want to see the flatness and the degree of chromatic aberration of a telescope in mind (e.g. Sharpstar 76EDPH). I have already "follow"ed it and get notification emails. So, I can see the images taken by that scope but what I want to really know is if a reducer or flattener was used and if the image was cropped or not. The image metadata has "Imaging Telescopes Or Lenses" and "Accessories". It seems that "Accessories" is the place to indicate if a reducer / flattener was used but I'm not 100% sure that everyone uses "Accessories" in this way. Why aren't there "Focal length" and/or "F-ratio" and/or "Reducer / Flattener"? If they were, they would be more reliable attributes to indicate if a reducer / flattener was used. Still, I can't know if the image was cropped or not. Or even a mosaic or not. For example, I saw an image taken by ZWO ASI533MC Pro (which I have) but the resolution is more than 5000x5000 (ASI533MC Pro is 3008 x 3008). So, is it a mosaicked image? Again, additional attributes like "Cropped?" or "Mosaicked?" would be very useful. By the way, I'm in a free plan if that matters. |
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Hello, Great question, I usually check the equipment listed for the image. Most contributors include this information. As far as the image sizes exceeding chip sizes, from your 533 example, (I do this) a 2x drizzle was done during stacking of the subs then cropped (yielding a larger than native sub size). Most people with say if it is a mosaic image... I hope this helps... CS Tim Ray |
