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The power of the FFC will vary depending on the distance of the focal plane behind the Barlow. Refer to the technical illustration to determine the power (PDF document). "L" is the focal point if the FFC is not used, "L'" is the focal plane when the FFC and other accessories are used.
Visual
To use the Astro-Physics Maxbright Diagonal, we suggest one of these configurations:
- Basic Set: ADAT2 (Astro-Physics 2"/T2 adapter) + BPFFC (FFC) + AP16T
(2"/T-2 nosepiece)
| AP16T | $40.00 | in stock |  |
| BPFFC | $736.00 | Call |
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| ADAT2 | $40.00 | in stock | |
or
- FFC system components: BP17 (2" adapter) + BP28 (expanding ring)
+ optional BP25A, BP25B or BP25C (extension tubes) + BP6/7 (T-2 changer
system).
| BP17 | $64.00 | in stock | |
| BP28 | $45.00 | in stock | |
| BP25A | $27.00 | in stock | |
| BP25B | $30.00 | in stock | |
| BP25C | $25.00 | in stock | |
| BP6/7 | $70.00 | in stock | |
With the first configuration, the eyepiece focal plane will effectively be 152mm (+-10% depending on the style of the eyepiece) behind the FFC for an approximate 4x magnification. To get an exact measure of power requires the exact position of the eyepiece field stop with respect to the rear flange of the FFC Barlow. Use of the 1.25" diagonal with either the Astro-Physics adapter (ADA125) or the optional Baader quick change system places the focal point approximately 95mm behind the FFC Barlow for a 3x magnification. Using various extension tubes, the power can be increased to 8x.
Lower powers can be achieved by placing the eyepiece directly into the Astro-Physics 2" adapter (ADAT2) (or Baader 2" adapter and Quick Change) and placing the FFC Barlow into the 2" MaxBright Diagonal for an approximate 2x magnification (50mm focal point). The magnification will vary somewhat with eyepiece design. The above assumes that your telescope focuser has sufficient in-travel to allow this configuration to come to focus.
35mmm Camera
35mm SLR cameras have a built-in 55mm focal plane distance from the T-ring to the film plane. The lowest magnification of 2x is achieved by threading a standard T-ring directly to the back of the FFC Barlow body (without a 2" adapter).
3x to 8x magnifications are achieved by adding 50mm - 320mm of extension tube(s).
If you use the 2" Astro-Physics Adapter (ADAT2) and a 2" Astro-Physics Prime Focus Camera Adapter (part # starting with PFC or PFCT), the distance to the film plane will be 140mm for 3.7x magnification.
| ADAT2 | $40.00 | in stock | |
| BPFFC | $736.00 | Call |
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| PFCT | $43.00 | in stock | |
| PFCTCAN | $55.00 | in stock | |
| PFCTEOS | $65.00 | in stock | |
| PFCTKON | $55.00 | in stock | |
| PFCTMAF | $65.00 | in stock | |
| PFCTMAX | $65.00 | in stock | |
| PFCTMIN | $55.00 | in stock | |
| PFCTNIK | $55.00 | in stock | |
| PFCTOLY | $55.00 | in stock | |
| PFCTPTK | $55.00 | in stock | |
| PFCTPTS | $55.00 | in stock | |
6x7 Camera
To use a medium format camera requires the Baader M68 Quick Change System and the appropriate adapters and extension tubes. The lowest power without extension tubes will be between 3x and 3.3x depending on camera type: Hasselbad: 74.9mm and Pentax 67: 84.95mm.
| BPFFC | $736.00 | Call |
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CCD Camera
The FFC system allows you to achieve various powers with your CCD Cameras
such as the ST-7/8/9/10 or the ST-11000. If you thread the FFC directly
into your camera (without the 2" nosepiece) the lowest possible power
will be approximately 2x. When threading the FFC Barlow into the 2"
nosepiece of your CCD Camera (with color filter wheel closely coupled)
and insert it directly into the Astro-Physics 2" adapter (ADAT2), which
you have attached to the back of the FFC Barlow, the power will be approximately
3x. This will increase with the addition of extensions or other intermediate
accessories.
| ADAT2 | $40.00 | in stock | |
| BPFFC | $736.00 | Call |
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