IR Filter for OSC???

[JonM]

I have a new Atik 490EX Color camera and will be using it with refractors. The camera has a window over the chip but, Vic  at Atik tells me that the window is not an IR blocker.  I have always had IR block filters with color cameras. Does anyone know if an IR block filter is normally required for the 490 when used with a refractor?


Thanks,

Jon

[ChrisLX200]

It isn't a requirement for the camera - but may well be a requirement for the scope you are using. Most refractors won't bring IR light to the same focus as other wavelengths so using an IR block filter will reduce star bloating.

ChrisH