Quote:
Originally Posted by Grantd53
Hello, I am interested in buying some narrow band filters for visual use.
I am looking at either baader or astrnomik filters.
Before I purchase anything, I thought I wuold ask for some
recommendations and advice on which filters work best ...
Some questions I have are ...
Which visual filters are best ?
What can I expect to see from the different filters ?
Can visual filters also be used for astrophotography ?
Any advice and or recomendations would be appreciated ....
Regards Grant
|
Hi Grant,
I gave a presentation on "Visual Astronomy and the Use of Filters" at the Ice In Space Astro camp about 8 years ago.
You can download a PDF of my Presentation from here on the IIS Website
A couple of things are worth noting.
1) No filter is a substitute for clear dark skies
2) Narrowband (UHC Filters) generally are designed to work with an exit pupil of between 2mm and 4mm
The Astronomik UHC is very good. It has a fairly wide bandpass for a UHC and doesn't destroy the view of embedded clusters within nebulosity, like some other narrowband filters, but still provides a good gain on the nebulosity itself.
If I could only own one filter for visual astronomy it would be the DGM Optics NPB Filter, which is made by Omega Optical and also sold by them, as the Omega Optical NPB Filter
http://www.npbfilters.com/order-international.html
https://www.omegafilters.com/product/4384
https://www.omegafilters.com/product/4385
Of all the visual filters I own, have owned and have used used over the past 40+ years of visual observing (that's quite a few) it provides a decent gain on the largest range of targets and on the largest number of targets, compared to any other filter I have used. The added bonus is that compared to some of the other visual filters it is reasonably priced. It is a fairly tight bandpass UHC filter and it works exceptionally well.
Cheers
John B