We do have:
M46: DT-ring SP54 / M46 #2958046
M49: DT-ring SP54 / M49 #2958049
M52: DT-ring SP54 / M52 #2958052
M55: DT-ring SP54 / M55 #2958055
So, you need:
- Baader DSLR-2" Filter Holder M48/SP54 #2408166
- One of the stepper rings above. They all have a female (inner) SP54 thread and a male (outer) thread
- A stepper ring from M46, M49, M52 or M55 to your M40.5-thread. One of these stepper rings should be easily available at your preferred photo-dealer
- Baader DSLR-2" Filter Holder M48/SP54 # 2408166
- Baader Hyperion DT-Ring SP54/M52 for DT-Adapter II&III and Hyperion Eyepieces # 2958052
You can screw all mounted 2"-filters into the filter holder which use the astronomical 2"-thread of aproximately M48x0.75 or M48x0.6 (we try to make our threads so that the common 2"-filters fit, although there is no real standard for this thread.)
Our filter-cells like # 2459252L are made for round filters with a diameter of 47,4mm and offer a free aperture of 46,9mm.
Adaptation of 2 inch filters onto DSLR camera-lenses2 Inch Baader Filter Adaptation for DSLR Camera Lenses
Many astronomical filter-designs are perfectly suited for use with a DSLR-camera lens. Here we explain how to do this.
Our largest cell mounted filters measure 2" in mechanical diameter (having a metric thread of M48). The clear aperture is 46 mm.
In order to ease the adaptation of our 2" filters onto most camera lenses, we produce a general-adapter, to convert from the ASTRO-2" Standard (M48) into a more common photo-standard of SP54 mm. This ring is named: DSLR 2" FilterHolder M48/SP54 (item #2408166).
Individual lens adapters for most camera-lens threads are available to fit onto this filter holder. Larger lens threads may be utilized by adding another 62 mm stepper-ring.
Lens Adapter Ring: SP 54/M46 (#2958046) / SP 54/M49 (#2958049) / SP 54/M52 (#2958052) / SP 54/M55 (#2958055) / SP 54/M58 (#2958058) / SP 54/M62 (#2958062).
Step-up Rings (for cameras lenses with thread larger than M62): M62/M67 (#2968067), M62/M72(#2968072), M62/M77(#2968077), M62/M82(#2968082).M62/M67 (# 296 8067), M62/M72 (# 296 8072), M62/M77 (# 296 8077), M62/M82 (# 296 8082)
The animation right show how it works: The lens thread adapter (in this case M62 or M55 or M49) fastens onto the camera lens, next comes the Filter-Holder M48 (# 2408166) and lastly any 2" (M48) Baader-filter will thread onto the assembly.
|Optical tube length||5|
|Usage||to mount our 2" filters on any DSLR camera lens|
|Inner Diameter / Clear Aperture (mm)||47|
|Inner Connection (lens sided)||Thread, 2" (50,8mm)|
|Inner Connection (eyepiece/-camera-sided)||Thread, M48|
|Outer Connection (eyepiece/-camera-sided)||Thread, SP54|
|Adaptable to||DSLR camera-lenses|
|Compatible Brands||Baader Planetarium|
|Type of Adapter||Expanding piece, Filter holder|