You could order the L from astronomik directly (I've done that), the website is in post #2. OPT appears to carry the L-1, I would guess they sell the L-2 and L-3 also, a call would be in order. Ditto high point scientifc
What about narrow band filter would those be better for imaging both DSO and planetary targets or are they only meant for DSO?
Narrowband is specific to certain DSOs. They need to be low density nebulae. Those emit very sharp frequencies of light, denser targets like galaxies smear it out, although they contain less nebula which emit some narrowband. A small fraction of the total image. Clusters emit virtually none. Ditto planets.
I, and many others, like it, but it's quite specific to certain targets. And the narrowband filters are more expensive, they have to be in order to be, well, narrow. <smile> Instead of maybe $100 each for a good one, we're talking $200-300 (higher for very narrow Astrodons).
Before I make any purchase the Deep Sky filter product line can take good planetary images right (so the name is just for marketing purposes) and also why do companies sell LRGBC filter sets if the clear filter wont do anything?
1. Can't see why the deep sky wouldn't work for planets, but I can't be totally sure. You could email Astronomik and ask, or ask on the Solar System Imaging forum.
2. Beats me. I don't ever use one, haven't ever seen anyone use one.
"All color filters block near-infrared wavelengths to keep them from interfering with the signal. The L filter also must block the near-IR so that when you combine the L with the RGB, you don’t get unsupported signal. In other words, if your RGB filters block the IR, but the L doesn’t, there will be no color data to support the IR, and the IR data the L lets through will show up as an ugly gray in the picture."
Edited by bobzeq25, 15 December 2017 - 01:09 AM.