I've just completed a refractor using a Surplus Shed 90mm x 900m focal length objective lens, Celestron R&P focuser and GT mount. Anyone else have experience with lining the tube with black "speaker cabinet" carpet to control unwanted light reflections rather than flat black paint and aperture stops?
Surplus Shed optics
Posted 28 April 2014 - 07:50 AM
Welcome the the forum Moonstruck,
We certainly hope that you enjoy yout time here sharing this great hobby of ours.
Normally, this is restricted to large apature newtons etc. However, there is no reason why it can't be applied to refractors so long as it doesn't cut into the light cone etc...
Anything that kills the unwanted reflections will work fine, baffles are normally used in refractors, however, I have seen these also made from foam rather than metal.
Posted 29 April 2014 - 04:51 PM