What is this green thing???? Rho Ophiucus

[batema]

Hi,

Have I discovered something or is it a water drop causing this anomaly in my image. Bottom right I have a very green object in all my images of this object. Any ideas?

Mark

[gregbradley]

Looks like some sort of artefact and not real. Perhaps some junk on your camera or filter?

Greg.

[janoskiss]

Please keep your junk out of my oppressed sign of the Zodiac! :P Unless it's Comet 252P that was lurking in the general vicinity not so long ago. But six weeks seems like too long for it to hang around... :question:

[multiweb]

I can't see the green you are talking about. Is that the yellowish stuff next to Antares. I think that's normal. Great widefield Mars and Antares in one. :thumbsup:

[RickS]

Did you sneeze on the camera, Mark? :lol:

[RB]

Mark it could be an internal reflection in your lens.
Were you using a (prime or zoom ?) 200mm.
Perhaps with a UV filter attached?

RB

[h0ughy]

i agree with RB - its antares alter ego

[batema]

I am using a Canon 200mm L f2.8 prime with a UV filter attached to the front.

Mark

[RB]

That's it, just as I though (houghy too).
The UV Filter will do that, causing a (usually green) internal reflection off the back of it.

I always have high quality UV filters on all my lenses but I take them off when doing astro.

RB

:)

[batema]

I'll do the same. Thanks.