Baader Q-Barlow 2.25x / 1.3x

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Baader Q-Barlow 2.25x / 1.3x

# 2956185

€ 49.00 Price excl. German VAT tax (19%): € 41.18

In Stock  

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  • Baader Q-Barlow lense 2.25x, 1¼" barrel
  • dual factor lens assy (1.3x/ 2.25x)
  • Modern High-Transmission Multi-Coating all air-glass surfaces delivers a remarkably brilliant image with extremely low internal reflections
  • Extends the possible focal lengths of the Q-Turret eyepiece set

Product Questions

Dear Baader I have the q-barlow but the screwed into the eyepiece directly for 1.3x magnification is possible with any brand\kind of eyepiece or just with your classic orthos?
0
Question by: Sirio on Jul 17, 2018 11:09:00 AM | 1 Answer(s)
Description

Details

 Baader Planetarium Q-Barlow 2,25x / 1,3x

Without the housing, the Barlow lens can be screwed either into the eyepiece revolver (for 2.25x magnification) or directly into an eyepiece (for 1.3x magnification)
Q-Barlowlinse
The Q-Barlow lens can be unscrewed from the eyepiece adapter

This high-quality 2.25x Barlow made of exotic glasses provides the rare extension factor of 2.25x. So, there are no duplicate focal lengths when used with the eyepieces of the Q-Turret Set, and you can achieve higher magnification than with standard 2x barlow lenses if you do planetary photography with a web or video camera, and you can make better use of the camera's resolution. Read here the detailed report by Dipl.-Ing W. Paech: Hints + tricks for high-resolution lunar and planetary photography with a video module - a short "workflow" for SC telescopes with Baader accessories.

The Barlow can either be screwed into the Q-Turret eyepiece turret or combined via the special, included adapter with all 1.25 "eyepieces. In this case, it acts as a 2.25x Barlow. With the Q-turret revolver and the Classic Eyepieces, this results in the following focal lengths: 2.7 mm, 4.5 mm, 8 mm and 14 mm

Alternatively, it can also be screwed directly into an eyepiece and then increases the telescope focal length by a factor of 1.3. The Barlow element has an M28.5 male thread (corresponding to the filter thread of 1¼ "eyepieces), the housing has got a M28.5- female thread.

Use on a planetary camera

The bare lens mount of the 2.25x Q-Barlow lens (without the 1.25" eyepiece holder) can be screwed into every 1.25" filter thread. To do so, remove the lenses with their threaded mount from the rest of the housing. Without the eyepiece clamp, the Barlow has no longer an extension factor of 2.25x, but only of 1.3x (when it is screwed completely into the filter thread). The reason for this is the shorter distance between the lenses and the image plane.

It may be that you can't insert the lens mount completely into the filter thread, then the magnification factor is closer to 1.5x.

But if the 1.25" nose piece of a camera provides a M28.5 filter thread, you can usually insert the Barlow completely, and because of the shorter distance the provided factor is ca. 1.3x. This is intentional and was one of the aims of the design. At 2.25x, an image circle of 25 mm is provided free of vignetting, while the fully lit image circle at 1.3x is 13mm.

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Specifications

Additional Information

Manufacturer Baader Planetarium
SKU (#) 2956185
Weight (kg) 0.067
Inner Connection (lens sided) Thread, M28,5
Outer Connection (lens sided) Barrel, 1¼"
Outer Connection (eyepiece/-camera-sided) Clamp, 1¼"
Clamping System Screw clamps
Magnification (x) 2,25x / 1,3x
AR-Coating High transmission multi-coated (HT-MC)
Adaptable to Q-Turret Okularrevolver und Classic Ortho/Plössl Okulare, 1¼ Okulare
Usage Erweitert die möglichen Brennweiten des Q-Turret Okularsatzes.
Barrel Size (in) 1¼"
Optical Design Barlow
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