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Hi
I run several astronomy apps (The Sky, Starry Night Pro, SkyTools, etc) and each one seems to implement its own red light or night scheme. If I use a red filter, sometimes the Menu options or drop down menus become "invisible" if they use red text, so I gave up on red filters and now use a "neutral density" filter. A sheet of ND2 or ND3 cost me $15 from the Production Shop in Brisbane, a film/theatre lighting shop. The stuff comes on 1 metre wide rolls and the smallest cut off is 1/2 metre. It's really tough and will not tear so it’s great for the rough and tumble of an astrocamp. As it attenuates all wavelengths equally, it does not alter the relationship between the different colours so I can now see all the Menus clearly.
Cheers
Dennis
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