CANON w/Camera Lens-also F6.3 reducer

[FOOTPRINT]

Hi All,
Gave the Canon (modded) a try using an 200 mm Camera Lens on M42/2042-IC434, sharp enough but a lot of stars seem large (maybe they are), also tried out a MEADE F-6.3 Focal reducer on the ED80 with the Canon on ngc3372 Carina (to get the lot- last Pix. was without a F/R), seems O.K., but not as sharp as the ED80 alone.
Anyone who has used Camera Lenses with the Canon (for astrophotography) might like to comment on the Large Stars ????.
M42/IC434- 6 x 2 Min. Exp.-DF removed
ngc3372-4 x 6 Min. Exp.-DF removed.

cheers........Jim

[h0ughy]

http://www.ayton.id.au/gary/Science/Astronomy/Ast_PhotoDigital_prime_focus.htm has something about the lenses in that. Nice images.

[RB]

Yes Jim,
For Astro through the Lens I would recommend you use a minus violet filter, like the one Lumicom advertise for this situation.
Stars bloat using the lens system because the lens is not a true APO lens, so the blue wavelengths don't come into focus like the other colours causing bloated stars. A minus violet filter helps.

[avandonk]

The first picture looks like it is slightly out of focus. Accurate focus is critical and difficult to attain. What 200mm lens was it.
If the Meade FR is designed for a SCT it wont work correctly with a refractor.

Bert

[FOOTPRINT]

Hi All,
Thanks for the comments, and HOUGHY-Thats a good website, vey informative, Many thanks, Bert- The F 6.3 MEADE/Celestron reducers do work well with the EOS300D, as the picture shows, and on the website Houghy mentioned there is a complete explanation/pictures of same, the F-3.3 Reducer does not work.

cheers........Jim

[tornado33]

Nice pics there.
Does your modded camera have the clear glass filter, or an IR cut one but with a lower cut to allow in H alpha?, if its a clear glass one you need something like the baader ir/uv cut filter, as excess ir light will focus differently to visible and cause the "star bloat"
Scott