M17 in O111

JohnG (John) · #1 19-06-2006, 11:14 AM

Hi all

M17 taken in the light of O111.

14 of 20 exposures at 100 seconds, ISO 800.

Auto Process and Digital Developement in ImagesPlus 2.75, Master Flats, Darks and Bias used.

Focused and automated exposures in DSLRFocus.

Noiseware (Free) and Photoshop 7.01, cropped.

Takahashi FS-102 at prime focus (f/8.0), TeleVue Bandmate O111 filter, Canon EOS 350D (Unmodded) autoguided with SW ED80 guidescope and ST-4.

Cheers

JohnG

Dennis · #2 19-06-2006, 12:14 PM

Hi John

That is a very cool and creative interpretation of such a familiar object. Was it difficult focusing due to the restricted light transmission of the O III filter, even with the Tak at f8?

Cheers

Dennis

JohnG (John) · #3 19-06-2006, 12:24 PM

Hi Dennis

Thanks for the comment, yes it was a bit more difficult, I have marked on the focuser of the Tak my start positions for PF, Focal Reducer and Focal Extender. I normally go straight to that point and start final focus from there, for some reason putting the O111 filter in changed that completely, was lucky that there are a few bright stars in and around M17 to focus on.

Been wanting to do this shot for awhile.

Cheers

JohnG

h0ughy (David) · #4 19-06-2006, 12:49 PM

thats really nice image there John, are you going to do a set and package together of the different wavelengths?

Striker (Tony) · #5 19-06-2006, 01:35 PM

Interesting image John..

I too am going to try and do some tricolour or mapped colour images with a DSLR....I had a go with the OIII filter the other night on the ED80 and found how good it was to have DSLR focus...the exposure's need to be pretty long to get any detail and even worse with a SII Filter so they say.

Look forward to more OIII images John.

tornado33 · #6 19-06-2006, 03:38 PM

Yes a most interesting image.
Ive got a Lumicon o3 filter, it also lets in H alpha light , I should give it a try, though its only 1.25 inch.
Now all I need is a Sulphur 2 filter lol.
Scott

JohnG (John) · #7 19-06-2006, 10:12 PM

Thanks for the comments, this was an experimental shot, I intend to do other objects that shine brightly in the light of O111 and see the difference.

I got considerably more detail than I expected.

Thanks

JohnG