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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.
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:
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.
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
Darks, Flats and Bias frames calibrated. Total exposure time for H-alpha line is 16h!


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 Metsavainio said...

Hi Phil!

Thanks, no, I'm using T-thread.
Please have a look here:

Less radical and permanent method is use of an adapter between the lens and the camera.
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.

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