Brand: Baader Planetarium

Baader Planetarium OPFA Eyepiece Projection Adapters

Brand: Baader Planetarium

Baader Planetarium OPFA Eyepiece Projection Adapters

  • OPFA – Eyepiece Projection Adapters
  • Delivery without projection eyepiece
  • For imaging with digital and/or analog (D)SLR cameras with removable lens
  • Consists of base version OPFA (single parts see OPFA IV) and additional lens sided adapters on other ADPS versions
  • Delivery without projection eyepiece
  • For imaging with digital and/or analog (D)SLR cameras with removable lens
  • Consist of base version OPFA (single parts see OPFA IV) and additional lens sided adapters on other ADPS versions
Special Order
$55.00 USD

OPFA Version Option

I (1 1/4" Barrel) II (2" Barrel) III (2" SC_Thread) IV (T-2 Inner Thread) V (M44 Zeiss Thread) VI (M43 Vixen Thread) VII (M36.4 Vixen/LAK/Lichtenknecker Thread)

Easy Payment Options with .

How do I Special Order?
Special Order
$55.00 USD

Easy Payment Options with .

How do I Special Order?
Free Expert Support
Stress Free, Secure Shopping
30 Day Return Policy
Price Match Promise
Full Details Specifications Reviews and Questions

Product Description

Baader OPFA Eyepiece Holder for Classic Eyepiece Projection with SLR and DSLR Cameras

Each OPFA is a complete accessory set for focal photography and eyepiece projection (without projection eyepiece and without T-2-ring for the camera) with connection to the telescope, sliding focuser and 2 pieces of 40mm T-2 extension tubes. A suitable T-2-ring for your camera must be ordered separately.

OPFA Eyepiece Projection Adapter Lineup

Our OPFA projection systems can be set to be light-tight and bolt-tight, so nothing can wobble anymore. With additional T-2 extension tubes, even extreme projection scales can be achieved - even with CCD cameras!

Each eyepiece projection works in the same way, although there are some practical differences wheather the camera is used WITH or WITHOUT lens. When working with a (digital) SLR camera, the lens is usually removed, and the camera body is attached directly to the projection unit.

If the camera lens is integrated into the system, this is called afocal projection. This is the usual method when shooting with digital viewfinder cameras, where the lens can NOT be removed. For these cameras, we recommend the ADPS, which can be set to a short distance between eyepiece and camera lens. The following diagram shows the structure of the classic eyepiece projection with cameras, where the lens can be removed.

OPFA Eyepiece Projection Adapter Focal Lengths

The focus plane or focal image of the telescope is projected onto the film/camera sensor via a projection eyepiece (similar to a slide projector, which projects the magnified slide onto a screen). The resulting focal length is called the equivalent focal length (f_E).

The reproduction scale depends on the focal length of the eyepiece (f_EP) and the projection distance (a). The equivalent focal length is calculated as follows (the longer it gets, the bigger the image on the film becomes):

f_E = f_primary × ((a ÷ f_EP) - 1)

The effect of the different parameters can easily be seen from the formula. If the eyepiece focal length is reduced and / or the distance a (between focal point of the eyepiece and the camera sensor/film) is increased, the value of the equivalent focal length (and with it, the magnification) increases; the picture gets bigger.

Our OPFA Units are Set Up (from right to left) as in the Following Example

Note: The parts marked in blue correspond to the OPFA-4 basic version, which has a male T-2-thread on the with camera side and a female T-2-thread on the telescope side. Each OPFA (model 1-3 and 5-7) has got another telescope adapter included in the scope of delivery. In the example, the adapters of OPFA 1 and 2 are shown in green. The parts marked in red are not included in any OPFA!

The unit starts on the telescope side, i.e. on the focuser (to the right). Shown in the picture are OPFA-1 (1 1/4" nosepiece) and OPFA-2 (2" nosepiece). If your focuser has a different connector, you have to choose between OPFA-3 and OPFA-7 (e.g. OPFA-3 for Celestron and Meade Schmidt-Cassegrain telescopes).

This is followed by a sliding focuser with a T-2 locking ring. The 1 1/4" eyepiece (not supplied) is inserted into this sliding focuser and clamped in. The function of the locking ring and the sliding focuser is described below.

Now, the two 40mm T-2 extension tubes are screwed onto the sliding focuser, the eyepiece (outer diameters of up to 38mm are possible) will be inside of the T-2 extensions. The extensions are used to set the distance between eyepiece and camera (ie to establish the projection distance). By adding more T-2 extensions (see our Astro T2 system), the distance (and the image) can be enlarged.

The OPFA is connected to the (digital) SLR camera through a camera-specific T-ring (not included).

The Function of the Sliding Focuser and the Locking Ring

The sliding focuser makes a fine adjustment of the projection distance possible a by slightly pushing the eyepiece forward or backward.

By loosening the locking ring, the complete unit can be rotated steplessly, until the attached camera is to set to a favorable orientation. Of course, for the models OPFA-1 and OPFA-2 the camera can also be rotated with the complete unit.

In the models OPFA-3 to OPFA-7, the connection from the OPFA to the focuser is a rigid screw connection. Here, the camera orientation can only be changed via the locking ring of the sliding focuser.

OPFA Eyepiece Projection Adapter Assembly

Specifications

OPFA VERSION I (1 1/4" Barrel) II (2" Barrel) III (2" SC_Thread) IV (T-2 Inner Thread) V (M44 Zeiss Thread) VI (M43 Vixen Thread) VII (M36.4 Vixen/LAK/Lichtenknecker Thread))
MANUFACTURER Baader Planetarium Baader Planetarium Baader Planetarium Baader Planetarium Baader Planetarium Baader Planetarium Baader Planetarium
SKU (#) 2458141 2458142 2458143 2458144 2458145 2458146 2458147
EAN CODE 4047825010155 4047825010148 4047825010131 4047825010124 4047825010117 4047825010100 4047825010100
NET WEIGHT (KG) 0.17 0.20 0.18 0.15 0.17 0.16 0.16
USAGE Adapter Adapter Adapter Adapter Adapter Eyepiece Projection Adapter Eyepiece Projection Adapter
CAMERA ADAPTABLE For Photography with Digital and/or Analog SLR Cameras with Removable Lenses For Photography with Digital and/or Analog SLR Cameras with Removable Lenses For Photography with Digital and/or Analog SLR Cameras with Removable Lenses For Photography with Digital and/or Analog SLR Cameras with Removable Lenses For Photography with Digital and/or Analog SLR Cameras with Removable Lenses For Photography with Digital and/or Analog SLR Cameras with Removable Lenses For Photography with Digital and/or Analog SLR Cameras with Removable Lenses
INNER DIAMETER / CLEAR APERTURE (MM) 38 38 38 38 38 38 38
OUTER DIAMETER 55.0 60.0 60.0 60.0 60.0 60.0 60.0
ADAPTABLE TO 1 1/4" Focusers 2" Focusers Celestron (and Meade) Schmidt-Cassegrain Reflecting Telescopes T-2 Threads Zeiss Telescopes with M44 Internal Thread Vixen Focusers with Internal M43 Thread Vixen Focusers with Internal M43 Thread
OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED) M42 x 0.75 (T-2) M42 x 0.75 (T-2) M42 x 0.75 (T-2) M42 x 0.75 (T-2) M42 x 0.75 (T-2) M42 x 0.75 (T-2) M42 x 0.75 (T-2)
INNER CONNECTION (LENS SIDED) M28.5, M34, M42 x 0.75 (T-2) M34, M42 x 0.75 (T-2), M48 M34, M42 x 0.75 (T-2), 2"/SCT Thread (50.8mm) M34, M42 x 0.75 (T-2) M34, M42 x 0.75 (T-2) M34, M42 x 0.75 (T-2) M34, M42 x 0.75 (T-2)
OUTER CONNECTION (LENS SIDED) ø 1 1/4" (31.75 mm) ø 2" (50.8mm) N/A N/A M44 M43 M36.4
TYPE OF ADAPTER Extension, Variable Focusing Extension, Variable Focusing Extension, Variable Focusing Extension, Variable Focusing Extension, Variable Focusing Extension, Variable Focusing Extension, Variable Focusing

OPFA Eyepiece Projection Adapter Lineup

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

Why Should You Trust All Star Telescope?

We've Made All The Mistakes
So You Don't Have To

Learn More