O111 filter question

[Doc]

Is there a difference in the colour you see when looking through a visual O111 filter compared to a Imaging O111 filter.

I have the Baader Narrowband O111 and it's visually green when observing. Is this correct. Or have I got an imaging one by mistake.

A few other people have different brands of O111 and they see an image thats white.

[Merlin66]

A CCD OIII filter usually has a narrower bandwidth and stops the close H beta. The visual OIII usually is broad band enough to include the H beta. In both cases the view/ image should ONLY be in the red ( 5007 A) - a white view would infer a broadband image passing both green, blue and red!!????

[Doc]

Thanks Merlin.....

So mine says Narrowband O111 filter and is visually only green so have I got the right one you think.

Should it say Broadband O111 filter for visual work.

[Merlin66]

Honestly hard to tell unless you see the transmission curves.

The eye is sensitive to the green so both H beta and OIII will register.....

[Doc]

Thanks for your help.

Time will tell I suppose, the more I use it the more I will get used to it.

[Ant]

I've just bought the OIII imaging version (with the IR cut).

Visually it's green as well...

Ant

[Doc]

I've just bought the OIII imaging version (with the IR cut).

Visually it's green as well...

Ant

Thanks Ant thats put my mind at ease.

[Johnboy]

Hi Doc,

I have this http://www.firstlightoptics.com/proddetail.php?prod=skywatcher_oiii_filter for visual and it's green whilst observing. Hope this helps.

John

[Doc]

Hi Doc,

I have this http://www.firstlightoptics.com/proddetail.php?prod=skywatcher_oiii_filter for visual and it's green whilst observing. Hope this helps.

John

Thanks John this helps alot.