Orange Bright Brand filters

[Manav]

Just wondering if anyone is using the Narrow Band Pass filter Hydrogen Alpha (H-α) from Orange Bright Optic Inc?

Website Link Click Here (http://www.ob-optics.com/content/products.php?act=detail&cid=29&tid=%2056)

I'm thinking of getting this for my QHY9 and was wondering if there is positive feedback.

TC

[Tandum]

Did you get a price yet? They have a pretty broad spectrum, like 13mn.

[Saturnine]

Would be interested in their pricing as well, I'm in the market for an Wideband Ha filter for wide angle photography.

Jeff

[Manav]

The H.a filter is $180.00 with FWHM being 12nm or less the bandpass can be viewed here (http://www.ob-optics.com/content/products.php?act=detail&cid=29&tid=%2056).

The two things I'd like to know are:

1. This is parfocal with QHY9 not sure what that actually means?
2. Is 12nm reasonable or should I go lower? I'd like to do Ha imaging from my suburban area.

Take Care

[pmrid]

The bandpass width of a filter determines the width of the portion of the visible spectrum it admits. This becomes important if you're in light-polluted skies where you will get all sorts of other light sources showing up that you won't see, or won't see as much, in a dark sky area - like Mercury vapour, sodium, and so on. For example, the average Ha filter with a bandpass of 6-12nm will also show the NII lines at 658.4nm. If you want to be a real purist, then you would need a bandpass of 3-4nm to avoid that line.

The worse your light pollution, the narrower the bandpass should be - IMHO.

ANyone who wants a set of Orange Bright NB filters should PM me or check the ads below.

Peter

[Tandum]

It means will this filter come to focus at the same point as the other filters in the wheel. The focus point can also be effected by the scope you are using , the spacing to the reducer/flattener, is it exists, as well as the other filters in the wheel and the F ratio of the scope.

I'd suggest it doesn't matter that much cos you need so much Ha data to reduce the noise you would normally focus with the Ha filter and then spend the lions share of the night shooting Ha anyway. And if you don't check focus while the temp is dropping, no matter what ever you're shooting, you're a mug.

[Manav]

Robin - The pricing is the real roadblock here with Astronomik being out of my budget and Baader 7nm @ ~260AUD. I guess with limited options financially I might bite the bullet and go ahead with the Baader and hope it fits.

Regards
The Mug