Lagoon in O3

[Prickly]

Hi,

20 minutes (40x30 sec) using the DSI III and a GSO O3 filter. Here is a crop. I used drizzle 0.8x pixel res expanded to 140%.

Cheers
David

[seanliddelow (Sean)]

May iI ask how much an 03 filter costs?

[Prickly]

Hi Sean,

Andrews has them for around $69 although I think I got mine from bintel for the same price at SPSP.

Seems to do the job. Not as narrow as the Baader which is more selectively O3. This GSO one is apparently H-beta and OIII. Guess it depends on whether it matters. This shot was taken yesterday with moon pretty close and gibbous. i'd say very good for visual and nothing wrong with the filter.

Cheers
David

[Hagar (Doug)]

This filter has lit up the OIII area well but cant be to narrow as a lot of the Ha area has also been resolved qhuite well.

Nice image.

[Prickly]

Hi Doug,

I may be wrong but I understand there may be a relationship between the amount of Ha and Hb, and the filter will pick up Hb. So you are probably right there.

To be fair the post probably should be lagoon in O3 and Hb. Having said that some areas havent really come up much either that are strong in Ha I suspect.

Next time I might try some Ha dedicated and see what I can figure out.

Incidentally the halos in the eta carina image were caused by IR leak through the UHCS - fixed by coupling the semi-apo with it. Eventually I'll put an IR filter in the image train instead spaced further from the front filter. That explains the airy disk appearance of these halos.

Cheers
David

[peter_4059 (Peter)]

Nice shot David. The narrow band images have quite a different feel. I've got a Baader O3 and will have to give it a try with the DSI II. Thanks for sharing.

Peter

[Prickly]

Hi Peter,

Did you find you were getting halos at all with the DSI II due to the IR? Maybe its not so much of a problem with the newtonians.

Never was a problem with digital SLR but then the DSLR always had the baader filter in front of the chip - so essentially and IR in conjunction with the UHCS.

Cheers
David

[peter_4059 (Peter)]

I haven't noticed any real halo issues however I shoot with a Baader UV/IR filter permanently attached to the front of the camera (between the camera and the filter wheel).

[Prickly]

Thanks Peter,

Good to know the baader does the trick. I like the filter adapter - Its a good way to go. Did you get yours from an Aussie vendor?

Cheers
David

[peter_4059 (Peter)]

Hi David - No, unfortunately the plate is not a local product. Here's the link.

http://www.scopestuff.com/ss_dsif.htm

[Prickly]

Hi Peter,

Thanks - looking through some of their products I found these guys seem to have some good gear. There was this adapter too which might do the job - allows a 1.25 inch filter to be included in the optical train with a T- adapter.

http://www.scopestuff.com/ss_tfa1.htm

Incidentally - have you had to clean the chip with your DSI? If so how did you do so. Mine is not a closed unit as yet. I guess the advantages of the kit youve suggested is it will keep the dust out.

Cheers
David

[peter_4059 (Peter)]

David - that TFA1 is quite a good idea - think I might get one for my guide camera.

I have cleaned the DSI - tried with a blower, Arctic Butterfly and finally with iso-propyl alcohol and a swab. It has remained pretty clean since I installed the scopestuff plate.

Here's the cleaning instructions on the Meade site that I followed:

http://meade4m.com/forum/index.php/t...1.html#msg2171

[Prickly]

Hi Peter,

Excellent link once again.

Many thanks
David