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Re mods to DSLR - there's two options
-remove the standard inbuilt filter completely to give a "full spectrum" mod. This will allow you to record from the UV to the NIR ( 370nm to beyond 700nm
- replace the filter with a Baader UV-IR filter -this improves the camera response to Ha but blocks the UV below 395nm and the IR above 700nm
The top image shows the spectrum of Vega with a standard DSLR
the bottom the extended spectrum with the filter removed. (courtesy Jack Martin)
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