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Old 22-09-2016, 10:37 PM
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luka
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Which UV-IR filter

Few of us are building a camera based on the ICX453AQ sensor and the question arose which UV-IR blocking filter to use at the front. The filter will also seal the camera from the outside world. We are looking at Astronomik luminance filters. Astronomik offers 3 filters with different spectral properties (L1, L2 and L3, as in the link above). The choice will clearly depend on the rest of the gear used.

I am using SkyWatcher ED80 (gold) + Hotech SCA flattener. I used Baader UV-IR cut with my IR modded DSLR and it worked well (until I dropped the filter and smashed it). Baader filter has the same IR transmission cutoff as the Astronomik L2 but it looks more like L3 at the UV end so I am not sure if L2 or L3 would be a better choice.

Any hints would be greatly appreciated.
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Old 23-09-2016, 10:25 AM
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Merlin66 (Ken)
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Luka,
Looking at the graphs, unless you want to record data in the CaK-H region then either of the L2 or L3 would do the job.
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Old 26-09-2016, 09:00 PM
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Thank you Ken.

Just wondering, are there any other advantages of L2 over L3 apart from more light due to slightly larger transmission range?
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Old 27-09-2016, 07:12 AM
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Merlin66 (Ken)
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For conventional AP imaging, no I don't see any significant difference.
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