So I changed the focus tube on my 80ED for the uprated Crayford type, finished in glossy black. But was it worth the monetary investment? Let’s find out. Glossy black finish, smooth plastic, a fine looking aesthetic complete with additional goodies over the stock focus tube fitted to most Skywatcher series refractors; this uprated focuser looks to have everything you want.
But it isn’t that straight forward.
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The Optolong L-eXtreme Filter
The Optolong L-eXtreme filter is the bigger brother to the hugely popular and widely well received Optolong L-eNhance filter. The L-eXtreme is a duo-narrowband filter that lets through Hydrogen-Alpha and Oxygen-III wavelenghts.
The filter is used best on emission nebula and supernova remnants. I’ve had this filter for a while and used it between a DSLR and a dedicated astronomy camera. In this article I’ll be sharing my thoughts about this narrowband filter that was designed for use mainly with one-shot colour (OSC) cameras.
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