Newbie Moon photography query that would have been answered before so, sorry!

[Brendan of Borg]

Hello all,

I am sure that I am not the first query with this one but....

How come when I take a snap of that big old lump of rock 'up there' I get a blue outline on one edge?

Is it a EP or scope issue or dare I say it... a numpty who's holding the camera??!!

Cheers folks!

[Merlin66]

You don't say which telescope you are using.... but I'd hazard a guess and say its a achromatic doublet refractor, if this is the case, then you are seeing the chromatic aberrations from the lens.

A yellow filter will significantly reduce it.

Ken

[Brendan of Borg]

Hi Ken,

Cheers for the reply.

I am using a Meade ETX 60 with the meade filters it came with.

Still a filter fix?

[Merlin66]

Hmmm

I think the doublet on the 60mm may be part of the problem.. Certainly try it with a yellow filter first...

Ken

[Brendan of Borg]

Will do Ken, I already have a green moon filter so wondered if I would see an improvement with that? Have not used it much -the filter that is!!

[Merlin66]

Certainly worth trying, before committing to spend money.

Ken

[Cornelius Varley]

As the Moon is mostly grey why not simply convert your photographs to black and white ?

Peter

[Merlin66]

Peter,

The blue chromatic halo will still show unless you just separated out and used the green channel.

Ken

[LukeSkywatcher]

Sounds like chromatic aberration to me.

Not so long ago i took a fixed tripod image of Jupiter and it had a massive green CA halo around it. Iremoved the CA from the image using Adobe Photo Deluxe with the click of one button. Sorry i cant remember which button. It was a happy accident on my part.

Certainly filters are worth a go to neutralise it visually, but would they not make the moon appear a strange colour in images?

Maybe a moon filter would work?

I cant say i have really noticed bad CA in my 90EQ. If any.......it is yellow and only appears around maybe a quarter of the moon as a very thin line.

[Brendan of Borg]

Thanks all, think that it's time for me to.... fiddle about!!