Manufacturer: Baader .. Adapter
Product number: BA2458143

EUR 80,00


incl. 19 % VAT (DE)  
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  • Details..
  • Technical data..
  • In the box..
The basic thought:

When lunar details and planets shall be depicted with high resolution, the focal length of the telescope is often not enough. It has to be extended.

For a small extension, a Barlow lens like the Baader Hyperion Barlow BA2956180 is a good choice (and can therefore be found in the "we recommed" section), but for better utilization of large sensor formats, the achievable focal distances are still insufficient.

A popular method to reach this aim is eyepiece prjection. Here, the magnifying effect of the eyepiece is used for photography.

The OPFA adaptor holds the eyepiece on a defined place and connects the camera´s T2 ring to the telescope mechanically solid.


Practical work:

Advantage of the OPFA system compared with standard adaptations:
offers a variable distance for fine-adjusting the magnification
very variable because different T2 extension rings can be used for more magnification
parts screwed together, thus very stable and rigid
consists of T2 parts that can also be used otherwise


Components of the OPFA-3 SCT:
Adapter from SCT thread to T2
T2 push-focuser with T2 thread on both sides
two T2 extension tubes, 40 mm each


Which eyepieces are suitable for projection?

The OPFA accepts 1.25" eyepieces up to a diameter of 37 mm. Especially orthoscopic (Abbe) and Plössl eyepieces of 6-15 mm focal length are recommended.

How is the eyepiece put in place?

The OPFA can be disassembled completely. Place your eyepiece in the focuser and lock it with the thumbscrew.

Now, screw on both T2 extension tubes and your OPFA is ready to use. By using the shifting mechanism, you can adjust the magnification. The longer the distance between eyepiece and camera, the higher is the magnification.

Calculating effective focal length without using camera lens:

f_e = f_scope × ((a/f_ep) – 1)
f_e is the effective focal length
f_scope is the focal length of the telescope
f_ep is the eyepiece´s focal length
a is theprojection distance, the distance from the last eyepiece lens to the sensor or film


Calculating effective focal length if using camera lens:

f_e = f_cam × f_scope/f_ep
f_e is the effective focal length
f_cam is the focal length of the camera lens
f_scope is the focal length of the telescope
f_ep is the eyepiece´s focal length


The camera has to be focused to infinity for a correct result. This will also optimize image quality, as the lens is designed for this.


Information to the set-up:



The parts marked blue correspond the basic version OPFA-4 with T2-threads on both sides. "Schiebefokussierung" means push focuser, a "T2-Verlängerungshülse" is a T2 extension tube.

The parts marked green are included with OPFA 1-3 and OPFA 5-7 (shown here: OPFA-1 and OPFA-2). They are the telescope side connectors.

The parts marked red are not included with any OPFA! We offer eyepieces and T-rings in the "we recommend" section below.
Connection telescope side:SCT thread
Connection camera side:male T2 thread for T2 adapter ring
Eyepiece diameter maximal:37 mm
Fine adjustment of projection distance:10 mm
1 Eyepiece Projection Adapter, 4 parts
Dust cap for the camera-sided T2-thread



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