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Dust Cap


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hi George - DEFINITELY NOT.

this is effectively an aperture mask which reduces the brightness of the moon etc and may increase contrast - that said, it also reduces aperture and resolution. not worth using really but you may be able to buy a solar filter to go over the small hole.

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As Moonshane says IT IS NOT A FILTER OF ANY SORT - sorry for the emphasis but I'm sure you want to keep your eyesight!

To make a filter that is safe you would need to buy some Baader solar film First Light Optics - Baader AstroSolar Safety Film ND 5.0 and make a filter holder that will go over the small hole in the scope cover - the film is less than A4 in size and therefore not big enough to make a full aparture filter. If you are not very handy you can buy ready made filters that fit over the end of the scope First Light Optics - AstroZap Baader Solar Filter - you will then be using full aparture. These filters are safe.

(As an aside NEVER buy or use a so-called "eyepiece filter" - they sometimes come up for sale on fleabay - they will shatter - with obvious consequences.)

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That cap will cut down the aperture and so increase the focal ratio. This will make everything look dimmer by decreasing exit pupil size. It will also decrease resolution to a significant degree. Maybe useful for solar observing. For lunar observing, either use a neutral density filter, variable polarising filter, increase the power, or just let your eyes adapt to the light and soak in the views.

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