New Optolong 3nm Narrowband filters

[AstronomyUkraine]

Optolong announced the launch of a new set of 3nm narrowband filters. The launch date is unknown, but is expected in the near future. Shawn from Visible Dark has been reviewing a set of these filters, and the results look promising. The price of the set is quoted on the Optolong website as $1239 for the 2" version and $1019 for the 36mm version. No mention of a 25mm version.

 

https://www.optolong.com/cms/document/detail/id/161.html

 

Here is Shawn's results from the review made by Shawn.

 

 

 

 

[TareqPhoto]

I want to see a result from SII only, i watched the video and he did a great job, sounds all Optolong filters 3nm has no halo or barely there is for OIII at least, but i only need SII 3nm although i have that already from another brand, i just want larger size as 36mm or 2" at lower price.

[Nightspore]

I'm strictly 19th century visual, so I'm not sure that my experiences with filters are pertinent to this thread. In my experience the Baader UHC-S is technically a broadband. The ES OIII filters below are broadband.

 

 

The Baader/Celestron OIII is technically a narrowband.

 

 

I've discovered that broadband filters can be used visually with an exit pupil as narrow as 1.5mm. Narrowband filters will need at least 3mm.