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Celestron Evolution 925 wedge?


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Just have a really good cruise around the deep sky imaging forums and see how many people choose to use fork and wedge mounts. It really is very few. If you were to post a question asking if anyone had tried and failed with them then the answers might (or might not) give you pause. I would just do the experiment.

Then have a look at SCT images from long focal length scopes and ask yourself whether there is actually more real detail in these images than in images shot at much shorter focal lengths through refractors and Newts. My view is that, exceptionally, there is. Usually I don't think there is. But don't listen to me, just have a good look yourself.

This was taken with a 5 inch refractor, FL 980mm. Do I believe I could have done better with an SCT? Absolutely not, I believe the reverse.

M42%20TEC140%20LRGB%20V3-L.jpg

Big one; https://ollypenrice.smugmug.com/Other/Best-of-Les-Granges/i-kNjFmJW/0/O/M42%20TEC140%20LRGB%20V3.jpg

What camera would you use in this long FL scope? When you know, check out your pixel scale in arcsecs per pixel here. http://www.12dstring.me.uk/fov.htm

If it comes out below 1 arcsec per pixel the mount becomes everything. You are in premium mount territory and the american SCT mounts are certainly not that. The image I posted above was shot at 1.8 arcsecs per pixel which is not very ambitious - but it's realistic. And guidable. And fast.

Olly

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