To reduce the focal length of your telescope however, in order to increase the field of view (= less magnification) is more difficult. A reducer has to be calculated to optically match your telescope brand and model, otherwise you may not be able to reach focus and the image quality might be horrible, with an enormous amount of field curvature and/or spherical aberration
Unfortunately reducers are not our speciality, since we only offer reducers for very few such special optics. Also please note that the reducers that we do offer (such as the Alan Gee Telecompressor #2454400 - calculated for C8 or higher Schmidt-Cassegrains) are all mainly optimized for photography and cannot be used in combination with prism or mirror diagonals since the optical backfockus just is not enough.
Sorry, this is quite a complex area. For this reason we never offered a "universal" reducer for lowering magnification during visual observation.
The problem is that the front lens of the scope basically creates an image in a given distance, which is then magnified by the eyepiece. So, you need to get the eyepiece close enough to the front lens. In a spottin scope, the erect-image prism is mounted fix inside of the tube, and you can't get close enough. In a telescope, you can move both prism and eyepiece closer to the front lens.
While a Barlow lense moves the image further to the outside, it has to be even closer to the front lens than an eyepiece - with a refracting spotting scope, you'd have to remove parts of the scope's housing to get into focus. The prism and the internal focusing mechanism are in the way...
So, although you can attach the Barlow mechanically to a spotting scope, you wouldn't be able to reach focus and get a sharp image.
Only if you use a telescope as spotting scope like our C5 Schmidt-Cassegrain spotting scope, you'd be able to use the Barlow - but this only works with a very small number of spotting scopes.
The diract link to the PDF is
Thanks Jamie Pauley purchasing through Adorama in the US.
Bundle: MARK IV Hyperion Universal Zoom 8-24 mm eyepiece & Baader Hyperion Zoom Barlow lens 2.25x mag
The set consisting of the MARK IV Hyperion 8-24 mm Universal wide angle Zoom eyepiece (#2454826) and the Hyperion zoom Barlow 2.25x (#2454654) results in combination in a zoom eyepiece with a large focal length range. The set covers all eyepiece focal length from 3.6-24 mm.
This set can only be used on all astronomical telescopes; use with tripods is only possible without the Barlow lens.
MARK IV Bundle contains the following items:The Hyperion Mark IV Zoom Eyepiece with 2" barrelThe Hyperion Mark IV Zoom Eyepiece with 1.25" barrel
1) 1x Hyperion Universal Zoom MARK IV, 8-24 mm eyepiece with ClickStop Action (#2454826)
Versatile wide-angle zoom eyepiece with connection option for cameras.
- 2 "(left illustration) and 1¼" (right illustration) barrel
- 2" SC thread and 1 3/8" thread for spotting scopes
- Eyepiece holster with belt-strap, which fastens onto many tripod legs just as well, to serve as a bin for all dustcaps that may go astray otherwise
- Height-adjustable eyecup as well as a standard non-foldable and a winged rubber eyecup
- three dustcaps
2) 1x Hyperion Barlow Lens 2.25x (#2956180)The Barlow lens with T-2 adapter (above) and Hyperion zoom adapter 1.25 "(Center).
Increases the focal length of your telescope by a factor of 2.25, with docking adapters for camera (T2-system) and zoom eyepiece.
- T2 Photo-Adapter
- Zoom-Eyepiece Adapter
The Hyperion ClickStop Zoom Eyepiece with 1¼" and 2" Connector
There is an old saying that there is nothing like an eyepiece with fixed Focal length, if it should be the highest image quality. But this zoom eyepiece is second to none fixed focal length eyepieces, saving especially during mobile use so you don't have to carry many eyepieces around.
The Hyperion Universal Zoom is a perfect solution for all hunter, birdwatchers and astronomers alike, it brings a whole range with focal lengths from 8 to 24mm in a single high-quality eyepiece! It lets you continuously zoom with Clickstops at 8, 12, 16, 20 and 24mm. The only difference to the fixed focal length is that the field also varies from 53 Degrees at 24mm focal length up to 68 degrees at 8mm. This eyepiece was "Reverse" constructed unlike most other zoom eyepieces: largest field of view and the sharpest image at the highest magnification.
See a more detailed description of the eyepiece and its possibilities at the individual product page
Caution: On spotting scopes you can use the Hyperion zoom eyepiece only without the Barlow lens!The Hyperion Barlow lensHyperion Barlow threaded on the discontinued Mark III Hyperion zoom eyepiece in 1.25"(left) and 2" configuration (on the right)
Hyperion zoom Barlow lens - 2.25x
The 2.25x Baader Hyperion Zoom Barlow lens was designed especially to complement the Hyperion Zoom eyepiece. It converts the regular focal lengths of 8 to 24 mm to a range of focal lengths between 3,6 and 10,7 mm, while retaining the outstanding image quality for observing sun, moon, planets and double stars with high resolution.
The Mark IV Zoom, in conjunction with or without the Hyperion Barlow, covers all focal lengths between 3.6 to 24 mm.
The Hyperion Barlow works with every Hyperion 8-24 mm Zoom eyepiece ever produced. The barlow is attached onto the 1¼"-nosepiece. Because of the dual nosepiece of the Mark IV, it can be used at telescopes with 1¼" or 2" eyepiece clamps.
The Hyperion Barlow comes with a T-2 thread-adapter, to mount the Barlow in front of any camera or other accessories with T-2-threads. Combine it e.g. with a DSLR-camera – in this way the camera body will be equipped with a 1 ¼" nosepiece. The camera body just needs a standard T-ring to fit it onto any 1 ¼” eyepiece holder.
Attach the lens unit without the Barlow-adapter (A) directly onto many 1¼" eyepieces, whenever they do not already have an integrated barlow element. The result is a 2x Barlow with very good optical properties (see left image).Also included is an adapter on T2-thread. Thus, the Barlow can be used - for example, on a DSLR with T-Ring
Some highlights of the Hyperion Zoom Barlow Lens
- Triplet lens design for highest optical quality
- Anastigmatic Flatfield Design for high sharpness all over the field of view
- Baader Phantom CoatingTM Group for highest contrast and light transmission
Connections Eyepiece side
- Direct connection to any Hyperion Zoom with Barlow-adapter A
- T-2 (M42x0.75 mm) thread with Barlow-adapter B
- 1¼" filter thread without additional Adapter
Attention: The Barlow lens is only suitable for use in astronomical telescopes; the use of spotting scopes is not possible.
|Focal Length||3,6 - 24 mm|
|Apparent Field of View||48° - 68°|
|AR-Coating||Phantom Coating® Group|
|Barrel Size (in)||1¼", 2"|
|Speciality||Eyepiece projection: classical|
|Number of Lens Elements||7|
|Number of Groups||4|
|Slip Protect Safety||Safety Kerfs|
|Eyepiece Body above Reference Plane (mm)||81 mm|
|Length of 1¼" barrel (mm)||24,5 mm|
|Length of 2" barrel (mm)||27 mm|
|Outer Diameter||55 mm|
|Outer Connection (eyepiece/-camera-sided)||Thread, M43|
|Inner Connection (lens sided)||Thread, 1 3/8", 2" (50,8mm)|
|Outer Connection (lens sided)||Barrel, 1¼", 2" (50,8mm)|
|Threaded for filters||Yes|
|Dustcaps||1¼" dustcap (31,8mm), 2" dustcap (45mm), 2" dustcap (46.5mm - fits over eyecup)|
|Eyecups||large height adjustable eyecup (M43), small eyecup (M43), winged eyecup (M43)|