Description

Today's large sensor digital SLRs and advanced imaging techniques enable amateurs to take spectacular high resolution and long exposure images that push the limits of modern telescope optics. Up until now, the only means of coupling a DSLR to the telescope relies on the use of a standard mass produced camera T-Ring. Unfortunately, T-rings have failed to evolve with the demanding needs of the advanced astro-imager:

The use of 42mm T-thread for the coupling causes a choke-point in the imaging train (typcially 38mm internal diameter), resulting in vignetting in fast systems.
High resolution digital image sensors and their protective glass covers are highly vulnerable to dust that can enter the body each time the camera is coupled/uncoupled, or in open systems, particularly if the camera has been modified for full-spectrum use.
These commonly available T-rings are mass-produced for generic camera use, with general manufacturing tolerances and design, which result in a potentially loose bayonet fit that can cause focal plane squareness and long-exposure image shifting from lateral play and angular wobble.

Our New Baader Protective Wide T-Ring System for the Canon EOS evolves the T-Ring and solves these issues.

The 2" wide-aperture of the protective T-ring accepts 3 different attachment adapters, which are included with each T-ring: Standard T-thread (42mm), 2" thin profile nosepiece, and 48mm thread (astro filter standard).
The internal filter compartment is able to accept both Baader 2" mounted filters, and 50.4mm diameter unmounted filters for the widest clear aperture possible (47.3mm aperture).
The optimized design and tight manufacturing tolerances ensure the closest fit possible with the Canon EOS body. This avoids the occurance of focal plane tilt and image shift caused by play and wobble at this connection point.

The Baader Protective Wide T-Ring System includes 6 configurable parts:

Protective T-ring Body
Temperature Compensation Ring (for installation of 50.4mm x3mm unmounted filters)
Adapter S52/M48 (for 48mm connection thread)
T-thread/M48 adapter (for standard 42mm T-thread connection)
S52/2" wide aperture 2" nosepeice (includes M48 filter thread)
1.5mm Allen Wrench

In addition to the basic system, the Protective Wide T-Ring system is available with 4 different pre-installed Baader 50.4mm x3mm filters: Clear, UV/IR Cut, UHC-S, and 7nm H-alpha.

Manual

Protective Wide T-Ring Instruction Manual

Specifications

Base Version (no filter)

MANUFACTURER	Baader Planetarium
SKU (#)	2958550
EAN CODE	4047825024718
WEIGHT (NETTO)	0.13
OPTICAL LENGTH (MM)	12
CLAMPING SYSTEM	Dovetail clamp
USAGE	Protects the camera body against dust and humidity
SCREW TYPE	6x M1,3 Allen wrench screws
INNER DIAMETER / CLEAR APERTURE (MM)	41
OUTER DIAMETER	64
INNER CONNECTION (LENS SIDED)	Thread, Dovetail ring clamp, S52, T-2 (M42 x 0,75), M48
OUTER CONNECTION (LENS SIDED)	Barrel, 2" (50,8mm)
INNER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Thread, M48
OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Dovetail ring, Bayonet, S52
COMPATIBLE BRANDS	Astro T-2, Baader Planetarium
TYPE OF ADAPTER	Camera Adapter, Filter holder, Reducing piece

incl. Clear Filter

MANUFACTURER	Baader Planetarium
SKU (#)	2958550C
EAN CODE	4047825026385
WEIGHT (NETTO)	0.195
OPTICAL LENGTH (MM)	12
CLAMPING SYSTEM	Dovetail clamp
USAGE	Protects the camera body against dust and humidity
SPECIAL FEATURES	with built-in clearglass filter
SCREW TYPE	6x M1,3 Allen wrench screws
INNER DIAMETER / CLEAR APERTURE (MM)	41
OUTER DIAMETER	64
INNER CONNECTION (LENS SIDED)	Thread, Dovetail ring clamp, S52, T-2 (M42 x 0,75), M48
OUTER CONNECTION (LENS SIDED)	Barrel, 2" (50,8mm)
INNER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Thread, M48
OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Dovetail ring, Bayonet, S52
COMPATIBLE BRANDS	Astro T-2, Baader Planetarium
TYPE OF ADAPTER	Camera Adapter, Filter holder, Reducing piece

incl. H-alpha 7nm Filter

MANUFACTURER	Baader Planetarium
SKU (#)	2958550H
EAN CODE	4047825102348
WEIGHT (NETTO)	0.194
OPTICAL LENGTH (MM)	12
CLAMPING SYSTEM	Dovetail clamp
USAGE	Protects the camera body against dust and humidity
SPECIAL FEATURES	with built-in H-alpha filter
SCREW TYPE	6x M1,3 Allen wrench screws
INNER DIAMETER / CLEAR APERTURE (MM)	41
OUTER DIAMETER	64
INNER CONNECTION (LENS SIDED)	Thread, Dovetail ring clamp, S52, T-2 (M42 x 0,75), M48
OUTER CONNECTION (LENS SIDED)	Barrel, 2" (50,8mm)
INNER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Thread, M48
OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Dovetail ring, Bayonet, S52
COMPATIBLE BRANDS	Astro T-2, Baader Planetarium
TYPE OF ADAPTER	Camera Adapter, Filter holder, Reducing piece

incl. UV/IR-Cut Filter

MANUFACTURER	Baader Planetarium
SKU (#)	2958550L
EAN CODE	4047825026392
WEIGHT (NETTO)	0.195
OPTICAL LENGTH (MM)	12
CLAMPING SYSTEM	Dovetail clamp
USAGE	Protects the camera body against dust and humidity
SPECIAL FEATURES	with built-in UV/IR-Cut filter
SCREW TYPE	6x M1,3 Allen wrench screws
INNER DIAMETER / CLEAR APERTURE (MM)	41
OUTER DIAMETER	64
INNER CONNECTION (LENS SIDED)	Thread, Dovetail ring clamp, S52, T-2 (M42 x 0,75), M48
OUTER CONNECTION (LENS SIDED)	Barrel, 2" (50,8mm)
INNER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Thread, M48
OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Dovetail ring, Bayonet, S52
COMPATIBLE BRANDS	Astro T-2, Baader Planetarium
TYPE OF ADAPTER	Camera Adapter, Filter holder, Reducing piece

incl. UHC-S Filter

MANUFACTURER	Baader Planetarium
SKU (#)	2958550N
EAN CODE	4047825026408
WEIGHT (NETTO)	0.197
OPTICAL LENGTH (MM)	12
CLAMPING SYSTEM	Dovetail clamp
USAGE	Protects the camera body against dust and humidity
SPECIAL FEATURES	with built-in UHC-S nebula filter
SCREW TYPE	6x M1,3 Allen wrench screws
INNER DIAMETER / CLEAR APERTURE (MM)	41
OUTER DIAMETER	64
INNER CONNECTION (LENS SIDED)	Thread, Dovetail ring clamp, S52, T-2 (M42 x 0,75), M48
OUTER CONNECTION (LENS SIDED)	Barrel, 2" (50,8mm)
INNER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Thread, M48
OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED)	Dovetail ring, Bayonet, S52
COMPATIBLE BRANDS	Astro T-2, Baader Planetarium
TYPE OF ADAPTER	Camera Adapter, Filter holder, Reducing piece

Downloads

Digiscoping- camera adaptations for afocal photography and eyepiece projection

Instructions for Protective T-Ring for Canon EOS

Accessories

Filters

Baader zero-tolerance protective Canon DSLR T-Ring T-2/M48 and 2"

Error