Baader O-III Filter (10nm) visual

At half bandwith. The 10 nm O III filters were done with older coating technology, hence peak transmission was around 85% - which might be the core of your question. The newer 9 nm O III filters are three cavity filters with steeper slopes, higher peak transmission and better off band blocking – it is another coating technology alltogether.

We cannot say if there will be more constrast with this filter than with the competiting filter because we have not tested their filter. Generally our visual OIII filter can be used with DSLR but even an modified DSLR is not a good camera for narrowband (OIII) photos. Only every 4th pixel is sensitive for this wavelength. You loose 3/4 of the resolution of the sensor wich makes the photo weak and unsharp.

Our largest cell mounted filters measure 2" (50.8mm) in mechanical diameter (having a metric thread of M48). The optical clear aperture is 46 mm. In order to ease the adaptation of our 2" filters onto most camera lenses, we do produce a 2" filter-holder, to convert from the ASTRO-2" Standard (M48) into a more common photo-standard of SP54 mm ("SP"means this is not a metric thread). For adapting any cell mounted Baader 2 inch Filter onto a camera lens with 52mm front filter thread you will need: #2408166 Baader DSLR 2" Filter-Holder M48 / SP54: https://www.baader-planetarium.com/en/baader-dslr-2%22-filter-holder-m48sp54.html #2958052 Baader Lens-Adapter-Ring SP54 / M52: https://www.baader-planetarium.com/en/baader-hyperion-dt-ring-sp54m52-for-dtadapter-iiandiii-and-hyperion-eyepieces.html Based on the SP54 thread, we offer many more adapters for various camera threads, our so-called Hyperion DT-rings. https://www.baader-planetarium.com/en/catalogsearch/result/?q=sp54