infrared filter

Is there any brand of infrared filter i should lookout for or avoid? the only one ive found so far is this unbranded one:

cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem...geName=WDVW&rd=1

would it be worth getting, as i want to get the best images i can of mars over december.

I have a Baader Red Longpass filter which I believe is similar to an IR-Pass filter. Otherwise I stand to be corrected.

The Baader filter cost me around 25 euro locally (brand new) from what I recall.

If you are into photometry, there is also the standard IR filter ("I") with the offering from Schuler perhaps being the most economical at around $60 (or 40 euro).

as the one on ebay gives very few details, should it be avoided?


What are the charachteristics required of an IR filter to be used for planetry ( and maby lunar) imaging?

Do you use this on your eyepiece i.e. screw it in like a regular colour filter?

What are the charachteristics required of an IR filter to be used for planetry ( and maby lunar) imaging?

I think for planetary and solar/lunar imaging, we wish an IR-blocking filter and not an IR-pass filter.

Most people have the Baader IR-blocker which is very cheap (in price).

Do you use this on your eyepiece i.e. screw it in like a regular colour filter?

Seanie,

Yes, the filter is threaded and can be used with either an eyepiece or imaging equipment.