#1  
Old 10-08-2014, 08:25 PM
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skysurfer
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Halpha filter for Canon EOS 6 ?

For deep sky astrophotography I use an unmodded EOS 6. Modding is too much hassle, limited use for regular photography as the white balance is disrupted because all photos are too pink.
And the display of red nebulas is not too bad.
Obviously after (un)installing the filter I have to refocus.

I am thinking about buying an Halpha filter which I will use for a series of frames which I'll stack together with unfiltered (or IDAP LPv2 filtered in light polluted areas) frames. Or make a stack of the filtered and unfiltered separately and then overlay both stacked images (the red and the 'light' one) and with Photoshop/GIMP. I have to experiment yet but am sure one option will work.
The trick is that exposure times of 'light' frames are limited in light polluted areas, so I can expose the red frames at least 4 times as long as the 'light' ones due to the narrow bandwidth. This will compensate the only 25% passthrough of Halpha in an unmodded camera.

How I have two choices:
* 12nm Astronomik clip-in for $279
This can be used with *any* lens or telescope as the filter is mounted direct over the sensor. But (un)installing in a dark (and usually moist) environment, even with a red headlight on, must be a tedious and very careful job. Also because I have to keep the camera pointed at exactly the same field with or without filter.


* 7nm Baader for $195
This can be screwed on the same lenses as the IDAS LPv2 2" screw filter or in the T2=>2" tube mounted on the camera which I put into the Genesis. Moreover, I can use it visually on the Genesis and on the 50 or 85mm lenses when used as a wide field mini scope. And no risk damaging the sensor / mirrorbox of my 6d and a lower price.

What are your opinions ?
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  #2  
Old 10-08-2014, 08:52 PM
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blink138 (Pat)
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the baader 7nm ha 2 inch filter is $360
pat
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  #3  
Old 10-08-2014, 09:12 PM
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skysurfer
Dark sky rules !

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Quote:
Originally Posted by blink138 View Post
the baader 7nm ha 2 inch filter is $360
pat
Strange, TS in Germany (see the link in the OP) sells it for $195.

BTW, I have never tried an Halpha visually but I did a UHC which allows seeing the North America Nebula even with the naked eye (with the filter) and as the NA nebula is Halpha only (i.e. no OIII or Hbeta) an Halpha filter should reveal it as well like other red nebulas (Rosetta, Running Chicken) ?
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Old 11-08-2014, 01:46 AM
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MrB (Simon)
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Pat doesn't say where it costs $360, but that would be about right from an Aussie retailer.
You say it is $195 at TS, but it is infact €195.
You would not pay the 19% VAT tho.
So, €195 / 1.19 + €36(freight with DHL) = €199.87
x 1.4457(Euro conversion) = $288.95 plus PayPal or credit card fees and conversion fees.

FYI, the Astronomik clip filters work quite well, a couple of test shots with a 60Da and 70mm achromatic here:
Ha: http://www.astrobin.com/90125/
Ha+OIII: http://www.astrobin.com/98888/
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Old 11-08-2014, 09:16 AM
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blink138 (Pat)
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Quote:
Originally Posted by MrB View Post
Pat doesn't say where it costs $360, but that would be about right from an Aussie retailer.
You say it is $195 at TS, but it is infact 195.
You would not pay the 19% VAT tho.
So, 195 / 1.19 + 36(freight with DHL) = 199.87
x 1.4457(Euro conversion) = $288.95 plus PayPal or credit card fees and conversion fees.

FYI, the Astronomik clip filters work quite well, a couple of test shots with a 60Da and 70mm achromatic here:
Ha: http://www.astrobin.com/90125/
Ha+OIII: http://www.astrobin.com/98888/
yes at myastro shop simon, even at opt i think it was still about
u.s $290
pat
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