Baader Morpheus 76° Eyepiece 17.5mm - 1.25"/2"
- 17.5mm Focal Length
- 76° Apparent Field of View
- 23mm Long Eye Relief
- Dual 1.25" and 2" Barrels
- 8-Lens Optical Design with ED & Lanthanum Glass
- M43 Thread for Photo-Video Adaptation
See exactly what the Baader Morpheus 76° Eyepiece 17.5mm - 1.25"/2" shows you, on real sky survey data.
Launch Visual AssistantThe Baader Morpheus 76° Eyepiece 17.5mm delivers an immersive, flat-field view across its true 76° apparent field, supported by a generous 23mm of eye relief. It has 8 lenses in 5 groups, with one ED and two lanthanum elements, a 23.55mm field stop and a 55mm body. The 1.25" and 2" barrels are integrated into one eyepiece, and the back focus gain is 21mm with the 2" barrel compared with the 1.25" barrel.
The Morpheus 17.5mm is engineered to deliver a sharp, geometrically correct image across its entire 76° field of view. The optical design consists of 8 lenses arranged in 5 groups, including one ED and two lanthanum elements. Morpheus eyepieces give a sharp image right to the edge of the field.
The angular magnification distortion is exceedingly low, so planets and lunar features keep their shapes as they cross the field, and the stated 76° is the true value calculated from field size and focal length.
The Phantom Group multi-coatings, pioneered in the Hyperion line, were further optimised for the Morpheus and index-matched to each of the different glasses, and the internal mechanics have been ray-traced and baffled against stray light and reflections.
The Morpheus 17.5mm has a 24mm long 1.25" barrel and a 21mm long 2" barrel integrated into one eyepiece, so it fits 1.25" and 2" focusers and diagonals.
The back focus gain is 21mm when the 2" barrel is used, compared with the 1.25" barrel. Baader's Slip-Protect Safety-Kerfs on the 1.25" and 2" barrels are numerous shallow kerfs that give additional grip and security against inadvertent drops from smooth-sided barrels, without the problems sometimes caused by traditional wide undercuts.
Eye relief of the 17.5mm is 23mm, the longest of the series. Eyeglass wearers can take in the full field with the Morpheus series.
Eye relief, the related large eye lens and ease of viewing are the factors behind the spacewalk feeling, and even at too large a viewing distance the object remains visible.
Baader designed the Morpheus series for binoviewing: a 55mm outer housing diameter throughout the series allows binoviewing from 55mm interpupillary distance, even for children, and the body has been made as small as possible for nose clearance.
The net weight is 0.45 kg; the technical data gives 415g for the eyepiece and 77.5mm for the body above the reference plane. The winged eyecup has a foldable side shield, which provides comfort and exclusion of stray light for binoviewing with eyeglasses.
Hidden beneath the eyecup is the M43 photo-video thread. The distortion of the Morpheus is even lower than in the Hyperion eyepieces, and the flat field design suits photographic projection.
The housing is hard aluminium alloy with industrial-quality UV-stabilised anodizing.
Our box list names the eyepiece, the standard folding rubber eyecup, the winged eyecup and the holster. Baader's scope of supply for the series also lists a storage box, three dust caps, the M43 extension and a focal length indicator clip.
Baader designed the Morpheus series for binoviewing: a 55mm outer housing diameter throughout the series allows binoviewing from 55mm interpupillary distance, even for children, and the body has been made as small as possible for nose clearance. A winged eyecup is supplied for binoviewing with eyeglasses.
The 1.25" barrel (24mm) fits a 1.25" holder and the 2" barrel (21mm) a 2" holder. The back focus gain is 21mm when the 2" barrel is used, compared with the 1.25" barrel.
Yes. The Morpheus 17.5mm is excellent for eyepiece projection photography. By unscrewing the rubber eyecup, you reveal a standard M43 thread. With the optional M43/T-2 adapter (#2958080), the Astro T-2 System and T-2 camera rings can be used for classical eyepiece projection; for afocal projection the M43/SP54 extension ring (#2954251) opens the Hyperion DT-ring system. A C-Mount adapter (#2958520) is also available for screwing matching cameras onto the eyepiece.
The design has exceedingly low angular magnification distortion, so the stated 76° is the true value calculated from the field size and focal length, and planets and lunar features keep their shapes as they cross the field.
Baader's Slip-Protect Safety-Kerfs on the 1.25" and 2" barrels are numerous shallow kerfs that give additional grip and security against inadvertent drops from smooth-sided barrels, without the problems sometimes caused by traditional wide undercuts.
Magnification is the telescope's focal length divided by 17.5mm; on a telescope of 1000mm focal length the 17.5mm gives about 57x. Exit pupil is the eyepiece focal length divided by the telescope's focal ratio.
A stainless steel clip that can be attached, for example, to the eyepiece holster. Bending up one or more of its little fingers according to the focal length lets you identify each eyepiece by touch, without looking and without a flashlight.
Baader's luminescent lettering glows in a soft green after the eyepiece has been in the light or briefly lit with a flashlight; the main letters shine for up to three minutes, so the focal length can be recognised in the dark.
Not exactly. Baader's technical data gives a field stop displacement of +2.5mm relative to the reference plane for the 17.5mm ("only 17.5mm Morpheus: reference plane + 2.5mm"), against 0mm for the 4.5mm to 14mm, so expect a small focus change when switching to or from the 17.5mm.
For classical eyepiece projection with a DSLR you need:
You may also want T-2 extension tubes to adjust the projection distance and magnification.
| Focal Length | 17.5mm |
| Apparent Field of View | 76° |
| Eye Relief | 23 mm |
| Barrel Size | 1.25" and 2" (integrated) |
| Optical Design | 8 lenses (includes 1 ED and 2 Lanthanum elements) |
| Coatings | Phantom Coating® Group |
| Outer Diameter | 55mm |
| Photo/Video Thread | M43 |
| Safety Feature | Slip-Protect Safety-Kerfs |
| Net weight (kg) | 0.45 |
| Field Stop Diameter | 23.55 mm |
| Parfocal Eyepieces | No |
| Special Features | Photo-luminescent engraving: lets you find the correct eyepiece at all times |
| Optional Accessories | Baader Utility Bag #2954201 for small accessories |
| Speciality | Eyepiece projection: classical |
| Threaded for filters | Yes |
| Field Stop Displacement to reference plane | + 2.5 mm |
| Number of Groups | 5 |
| Dustcaps | 1¼" dustcap (31.8mm), 2" dustcap (46.5mm - fits over eyecup), 2" dustcap (49mm) |
| Backfocus gain w. 2“ Barrel (mm) | 21 mm |
| Eyepiece Body above Reference Plane (mm) | 77.5 mm |
| Length of 1¼" barrel (mm) | 24 mm |
| Length of 2" barrel (mm) | 21 mm |
| Eyepiece Series | Morpheus |
| Inner Connection (lens sided) | M28.5 |
| Outer Connection (lens sided) | ø 1¼" (31.75 mm), ø 2" (50.8mm) |
Baader Morpheus 17.5mm Eyepiece
× 1
Standard Folding Rubber Eyecup
× 1
Winged Rubber Eyecup for Binoviewing
× 1
Eyepiece Holster / Belt Pouch
× 1