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Thursday, April 2, 2009

Sh2-223, 224 and 225 lightened up






I found some old H-alpha light frames, for this object, from my HD!
There was 15 x 1200s from 03.11.2008, I totally frogotten, that I had
shot them.
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You can compare how additional Five hours of H-a hellped by looking two previous versions.
First, there is only Two hours of H-a:
Really bad looking and noisy,
Secondly there was 11 hours of H-a, looks much better:
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This is a really dim Supernova Remnant pair, with fast, f1.8, optics
it has taken 16h of H-alpha light to get in this version.
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Details; -Camera, QHY9 - Optics, Canon EF 200mm f1.8 @ 1.8 - Guiding, QHY5 and PHD-guiding - Platform, LX200 GPS 12" - Exposures, 7x1200s with 7nm H-alpha filter and 13x2400s, 5x300s O-III Binned 4x4 and 5x300s. S-IIBinned 4x4 .
Additional 15x1200s of H-a added, imaged with QHY8 and Tokina AT 300mm f2.8 @2.8
03.11.2008
Darks, Flats and Bias frames calibrated. Total exposure time for H-alpha line is 16h!

2 comments:

Phil said...

Amazing images - well done.

What are you using to connect your Canon EOS lenses to the QHY9? Is it a commercial adaptor?

J-P Metsävainio said...

Hi Phil!

Thanks, no, I'm using T-thread.
Please have a look here:
http://astroanarchy.blogspot.com/2009/01/canon-200mm-f18-lens.html

Less radical and permanent method is use of an adapter between the lens and the camera.
http://qhyccd.com/ccdbbs/index.php
look for this forum, there is several solutions and products.
You can use the Search function in the forum.
I don't use a filter wheel. Instead that, I use a filter drawer.
http://www.gerd.neumann.net/v2/english/eng_filterdrawer.html

Remember, there is a very limited backfocus distance in the Canon lenses, it varys between the models.