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I've clicked on quite a few links to
images. Things like M42, M27, etc. They could be anything, only to be confronted by tiny images created with widefield, small aperture instruments. I admit these scopes do nicely when it comes to large DSOs like M31, or starfields, but there is nothing particularly interesting or useful about 1/2" wide images of M42, etc. I figure that people are using these things because they are easy to carry around, generally pretty fast (focal ratio-wise) and can be mounted on inexpensive, lightweight GEMs or forks to do photography with. But when the images look like they might have come from a Canon 300mm telephoto, generally something is missing. There is something to be said for images of individual deepsky objects created with scopes having focal lengths of 1000mm or more, and enough aperture (and hence focal speed) to capture the details in the average sized deepsky object. I remember a guy named Martin Germano who used to use a C8 to shoot planetary nebula, and I thought it was "daring" at the time because of the small image scale, but he even shot with longer (barlowed) focal ratios and long periods to obtain some decent image scale. I even remember one of the most memorable shots of the interior of M42 having been shot with a C11 used at 3900mm over a long exposure, and it was one of the first I ever saw to really capture the interior detail of the nebula and trapezium. Prior to that, I saw small m-42 shots all looking alike, with burned out cores and the outer nebula showing. |
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