| Which one? | |
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| L1 | |
| L2 | |
| L3 | |
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Hello guys. I am looking into purchasing a uv/ir filter and there are a few different options about how much of the spectrum the let in (L1,2,3). What difference would L1 from L2 and L3 make? Will I be able to tell the difference in an image? How do I choose which one to get? thank you. |
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My understanding is that the choice depends on your telescope and optical path. If you are using say a Newtonian with not much difraction from reducers etc then the widest band pass (L1 ?) might be appropriate. If on the other hand you have a relatively poorly corrected ED refractor doublet which might suffer from bloom at the blue end of the spectrum then a tighter band pass would be better (L3?) Tim |
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Hello guys. I am looking into purchasing a uv/ir filter and there are a few different options about how much of the spectrum the let in (L1,2,3). What difference would L1 from L2 and L3 make? Will I be able to tell the difference in an image? How do I choose which one to get? I mostly image with newtonians so star bloat from chromatic aberration is not an issue. Occasionally I do use my camera with camera lenses or short refractors. I’ve found the L2 is a great all rounder. L3 would be nice for some refractors or older lenses that have worse CA, and L1 would be good for purely reflective optics. That said, I don’t feel like I’m missing much by using the L2 with my newt. |
