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Baader C filter

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#1 Sunspot

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Posted 06 February 2013 - 10:04 AM

Hi all,

I was reading on Facebook that an ASI120 user had screwed a Baader C filter into the camera body as a way (successfully it appears) to keep dust off the sensor. I am not sure which Baader C filter he used. Baader sells a 1.25" and 2" model. Seems like the 1.25" would be too small and the 2" would be too big. I think the camera body thread is 42 or 43mm. Does anyone have any ideas?

Thanks!
Paul

#2 dobsoscope

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Posted 06 February 2013 - 10:46 AM

The FB post shows the 1.25 inch version
https://fbcdn-sphoto...1083492532_1...

#3 Sunspot

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Posted 06 February 2013 - 10:56 AM

Thanks! :foreheadslap: It was there all along and I didn't see it. :tonofbricks:

Paul

#4 dobsoscope

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Posted 06 February 2013 - 11:09 AM

Here is a "clearer" image
http://oc.agenaastro...8eab33525d08...

But why cannot one use the supplied uv/ir cut filter instead?

#5 Sunspot

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Posted 06 February 2013 - 02:08 PM

Rats!!! Absolutely correct..

Here is a "clearer" image
http://oc.agenaastro...8eab33525d08...

But why cannot one use the supplied uv/ir cut filter instead?



#6 Sunspot

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Posted 06 February 2013 - 09:32 PM

I just found out why the supplied filter is useless...it's an IR blocked filter which makes the 685nm IR filter useless. From the link it looks like the Baader filter is also IR blocked. Always something!

Paul


Here is a "clearer" image
http://oc.agenaastro...8eab33525d08...

But why cannot one use the supplied uv/ir cut filter instead?



#7 Freddy WILLEMS

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Posted 06 February 2013 - 09:42 PM

Can you just not install a clear filter that works with all the other filters ?

#8 dobsoscope

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Posted 07 February 2013 - 02:46 AM

The second message here says otherwise
http://www.cloudynig...wflat.php/Cat/1,2,3,4,5,8/Number/4943328/Main/4943042

I just found out why the supplied filter is useless...it's an IR blocked filter which makes the 685nm IR filter useless. From the link it looks like the Baader filter is also IR blocked. Always something!

Paul


Here is a "clearer" image
http://oc.agenaastro...8eab33525d08...

But why cannot one use the supplied uv/ir cut filter instead?



#9 Sunspot

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Posted 07 February 2013 - 09:32 AM

That's what was so confusing. The container in the link you posted earlier says IR-blocked, but the vendor assures me that it is not blocked so I'm going with that. I'll report back later on my observations.

Thanks for the help.
Paul


The second message here says otherwise
http://www.cloudynig...wflat.php/Cat/1,2,3,4,5,8/Number/4943328/Main/4943042

I just found out why the supplied filter is useless...it's an IR blocked filter which makes the 685nm IR filter useless. From the link it looks like the Baader filter is also IR blocked. Always something!

Paul


Here is a "clearer" image
http://oc.agenaastro...8eab33525d08...

But why cannot one use the supplied uv/ir cut filter instead?



#10 John Boudreau

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Posted 07 February 2013 - 09:35 AM

Here's the transmission curve for the Baader clear filter:
http://www.baader-pl...ilter_gross.gif

Looks like it will still allow use of a UV-Venus filter in addition to near-IR longpass filters.

#11 Sunspot

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Posted 07 February 2013 - 09:36 AM

Freddy,

That's what I hope the Baader clear filter will do for me...more later when it arrives.

Paul

#12 Sunspot

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Posted 11 February 2013 - 09:07 PM

John,

Thanks! That is more re-assuring. I just got the filter today and put it on the ASI camera. Of course it is cloudy and rainy tonight so I won't be able to test it until tomorrow night.

Thanks again.
Paul

#13 Sunspot

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Posted 12 February 2013 - 09:47 PM

Done with this. The Baader C filter does exactly what I'm looking for...over and out... :roflmao:

Paul

#14 dobsoscope

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Posted 13 February 2013 - 09:52 AM

Some are suggesting to simply remove the black foam surrounding the chip.. it does no harm.

#15 Rankinstudio

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Posted 13 February 2013 - 10:38 AM

Very useful information, thanks Paul :)

#16 Sunspot

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Posted 13 February 2013 - 10:49 AM

Thanks. I was wondering about that because after yesterday's adventures, it seems like that is where a lot, if not most of the motes are coming from.

Some are suggesting to simply remove the black foam surrounding the chip.. it does no harm.








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