Baader O-III 2" unmounted (Ø 47,4 mm) f/2 Highspeed-Filter (6.5nm) for FCCT – CMOS-optimized

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Baader O-III 2" unmounted (Ø 47,4 mm) f/2 Highspeed-Filter (6.5nm) for FCCT – CMOS-optimized

# 2961228U

€ 228.00 Price excl. German VAT tax (19%): € 191.60

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Which side should face the telescope?

47.4 mm (2" w/o cell) x 2 mm Baader O-III f/2 Highspeed Filter – Precision Grade
6.5 nm FWHM, recommended for extremely fast optical systems from f/3.4 to f/1.8
Specially designed for the special filter requirements when used with fast optics like the Celestron RASA astrographs
Reflex-Blocker™ hard coated and planeoptically polished – with sealed coating edges (Life-Coat™)
Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim
Optimized for modern CMOS cameras, but likewise excellent for CCD camera technologies

Qty:

Product Questions

What's the actual size of your 2" filters in "mm" with and without frame/ring? What step down adapter is suggested from a 52 mm to "-- mm"?

156

Question by: Waqas Ahmad on Oct 10, 2016 7:54:00 PM | 1 Answer(s)

What are the threads and pitch of your 1.25" and 2" filters?

Question by: Anders G. on Sep 20, 2017 12:55:00 PM | 1 Answer(s)

Our 1.25" filters have a M28.5 male (and M28.5 front female) thread / our 2" filters have a M48 male (and M48 front female) thread

Both thread sizes come with our proprietary pitch - which is not the same for the female and male threads.
This is our own proprietary "emergency solution" for uniting a world were manufacturers all over the world copy from each other - to the point that there are almost a dozen different pitches in use for male and female threads. Traditionally US-companies used to do a UNF-based pitch and the rest of the world went for metric threads - but these do vary from 0.5 to 0.75.

For this reason it does not make sense to publish our non standard pitch because our pitch is made to cope with all existing metric and US-pitch standards - and as said - our solution has evolved from sheer necessity. It is a mixture of a queer pitch and under-/over-dimensioning . We will not want to declare this as a standard and get bashed up for it. It works for us and is a result of 20 years adaptation to fit our filters onto all crazy threads we have seen. And inspite of this - every now and then there comes another "dragonboat-eyepiece" were even our filters may not fit...

Answer by: Baader Web Team (Admin) on Sep 22, 2017 1:43:00 PM

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Specifications

Additional Information

Manufacturer	Baader Planetarium
SKU (#)	2961228U
EAN Code	4047825050984
Net weight (kg)	0.07
Colour	Black
Transmission Range	O-III
Filter Thickness (without cell)	2 mm
HBW (Halfbandwidth)	6.5 nm
CWL (Central Wavelength)	500,7 nm
AR-Coating	Reflex-Blocker™ hard coated, planeoptically polished
Special Features	CMOS-optimiert mit Life-Coat™
Filter size	47.4 mm (2" w/o cell)
Filter Usage	CMOS, CCD, O-III
Filter mounted	Unmounted
Type of Filter	f/2 Highspeed
Single or Set?	Single Filter
Filter shape	round

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