Do mono webcams.....

[TheThing]

Probably a silly question, but...

I have a SPC900 that has been modified with a mono chip (as per my sig). When imaging with it in just black and white, do I still need to use an IR/Cut filter?

Thanks in advance.

[Smeg]

I guess only if you don't want IR

Would it not make more sense to remove all filters and image using proper 1.25" filters?

[Stephen]

I was advised IR cut not needed for mono

[TheThing]

Thanks gents.

I have LRBG filters, but for something like the moon, I believe this might be overkill!

[Psychobilly]

I was advised IR cut not needed for mono

So when your doing LRGB with a mono cmaera.. why do you use a L filter which usually have UV/IR cut...

An unfiltered mono CCD is sensitive to IR and depending on the scope and other accessories used the chances are that the IR will be focussed at a different point to the visible light and result in bloat...

Peter...

[Ant]

I had a discussion recently about another unrelated thing, but what came out of that was that with a mono cam (or at least my one) was that a IR/UV cut will help reduce star bloat.

Cheers

Ant

[Psychobilly]

You might want to consider using IR pass or deep red for the L...

Peter...

[riklaunim]

With mono cams you use RGB filters (that are IR/UV blocked) and sometimes broad band for luminance in a LRGB image. The standard L filter in LRGB set is IR/UV cut and it's quite hard to get good luminance from that filter (due to seeing and/or atmospheric dispersion). So if someone wants planetary LRGB image uses IR passing filter (either visual red/orange wratten longpass filters, or deeper IR filters like Astronomik ProPlanet 742).

[Stephen]

So when your doing LRGB with a mono cmaera.. why do you use a L filter which usually have UV/IR cut...

Peter...

Good point, I have no idea Just saying what I was advised (on here) for B&W

You might want to consider using IR pass or deep red for the L...

Peter...

I love my IR pass to bits on Jupiter at the moment. Not thought to turn it on the moon! Experiment for later in the month ...

[Psychobilly]

I think you wil "love it" for luna as well... when she pops up again...

[michaelmorris]

The mono chip is pretty sensitive to IR. It is likely that the optics in your scope are not optimised to bring IR and visible light to focus at the same point, so it makes sense to use an IR cut filter to increase the resolution.