Quote:
Originally Posted by NeilW
According to Bintel's description of this filter on their website:
"From the start, the Astronomik OIII filter has been very specifically designed for the visual observation of gaseous and planetary nebulae. The extremely narrow pass band of the two OIII lines brings a substantial contrast gain to these lines even under best observation conditions. On faint super nova remnants and faint planetary nebulae the Astronomik OIII filter will often make the difference as to whether the object can be seen or not!"
Maybe I just needed a darker sky.  |
Hi Neil,
I own the Astronomiks OIII filter in 1.25" and 2" format, amongst a host of other visual filters. It is an excellent filter and works very well on a number of emission nebula, including eta carina, the Orion nebula and the Tarantula Nebula. I would have suggested the DGM Optics NPB (which I also own) as a better "all round" visual filter for an 8" telescope, over the Astromiks OIII, but the Astronomiks OIII is still a very good choice. I reckon darker skies will help, if your skies aren't that dark. If your skies are "reasonable" that filter should have provided a noticeable effect.
Cheers,
John B