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

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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47.4 mm (2" w/o cell) x 2 mm Baader CMOS O-III f/2 Highspeed Filter – Precision Grade
2" Filter removed from filter cell, specially selected for use with 2" Filter sliders of the Baader FCCT (Filter Changer Camera Tilter) for RASA 8" and QHY cameras (various versions available)
6.5 nm FWHM, recommended for extremely fast optical systems from f/3.4 and faster
Specially designed for the special filter requirements when used with extremely fast f/2 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

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Product Questions and Answers

Do you have a question about this product? Then we would like to ask you to first look through the existing questions and answers, most likely your question has already been answered and you will get the desired information much faster this way. Your question is not listed? Then please click on the button "Ask a question".

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"?

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

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179

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)

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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
Suitable for f/ratio	f/3.4 and faster
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

FAQ

FAQ

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How do I adjust tilt and achieve micron adjustment with the FCCT, the UFC and M68 Tilter?
Each tilter essentially consists of 3 pairs of opposing set screws which independently move the inner tilt mechanics and are easily accessed from the side using the included hex key (Allen wrench). These screws have tapered and hardened points that bear against a precision hardened ‘zero-clearance’ steel-counterpart. The direction that each set screw moves the tilter is shown with an etched arrow next to the individual screw. On the FCCT the extra-long hex-key with handle also serves as torque-control against overtightening. As soon as the handle starts to rotate (to "flex") without continuing to turning the screw then the maximum torque allowed is reached and instead of continuing to increase pressure on that screw, the other screw in that pair first must be unlocked by a very small amount.

CAUTION: Never tighten a screw all too firmly, only light to medium tension is required to hold the tilter with zero play. Tightening the screws too hard may damage the hardened screw tips.

In the worst case, the hexagon socket in that 4 mm set screw may be "cracked", if the tightening torque is way too high. In this case, the tilter may need to returned for repair. For this reason, among others, we supply an extra-long hexagonal screwdriver for the FCCT filters. The long length of the 2 mm hex-rod acts like a torque wrench, because if too much force is applied, only the handle turns, but the tip of the hexagon does not continue to turn. In addition, with a RASA 8 tube, the turning handle of the hexagon is outside the tube diameter. With the other tilters, the spacing situation is not so tight, so in these cases such overlong screwdrivers are rather a hindrance.
1. Check each set screw to make sure it is lightly tightened down (seated). The screws only need to bear against the internal mechanism with light pressure.
2. To move the tilter in a particular direction, first loosen the opposite direction screw a very small amount, then lightly tighten the screw that moves the tilter in the direction you want it to go. Only very small adjustments are needed to square the mechanical axis, so only move the screws a small amount.
3. Final small tweaks may be made by very slightly increasing the pressure of just a single screw, or very slightly decreasing the pressure of the opposing screw.
Additional Tips:
- It is recommend that you start with the tilter set at its nominal position with both parts flush. The tilt allowed is approx 0.4 mm to either side.
- The amount of loosening and tightening controls the amount of tilt movement. Always put the image center into perfect focus first and then work out the edges.
- A simple way to check if overtightening occurs is to closely inspect each single image frame taken during the adjustment procedure to see if some upper or lower-side movement (that is: lateral movement) is visible when trying to move one screw in the system to adjust for more angular tilt. Even slightest lateral movement would indicate that at least one of the three pairs of screws is severely overtightened, as each tilter-system is mechanically matched to zero-play.
- In case lateral movement is visible at all in the image frame, then loosen the opposing screw by the same amount and it will cause a tilt action immediately. You will need some time to "get the right feel" just how finely each these three pairs of screws work as a team, to increase pressure and reduce pressure in order to do the adjustment in very minute increments. In this way, micron movements are possible.
- The FCCT is designed to carry up to 2 Kg of camera equipment, the larger M68 and UFC-tilter can take up to 5 Kg of camera total weight.
- The tilter should be positioned close to the camera, to reduce additional loads from having the camera cantilevered far from the tilter.

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