Converts the Altair Wave Series 80mm F6 ED Triplet refractor to an even faster F4.8 astrograph. Reduces exposure time and gives a larger, flatter field.
The camera-facing rear thread on the Planostar unit is T2 (M42x0.75mm) male, which allows the use of the Planostar DSLR Adapter for Canon/Nikon, and various T2spacers for use with Altair and other CMOS cameras.
Spacing from rear flat shoulder of the PlanoStar to the camera sensor plane can be fine adjusted using the Altair Astro T2 variable spacer system to fine-tune the optimum distance for their particular chip and filter setup.
|Recommended Planostar v2 0.8x Reducer Spacing:|
|Telescope model:||Sensor to reducer rear flange spacing (mm):||Focal Length in mm with reducer (& without reducer):|
|Altair 80ED Triplet||
Why should I use a field flattener/reducer with my refractor?
A field flattener / reducer performs 3 main functions:
1 Flattens the field: All refractor lens systems show some natural field curvature which, while not relevant for visual observation, can be visible in images. A field flattener creates a flatter photographic field than the existing lens system alone, improving the quality of star-shapes at the field edges.
2 Reduces magnification: An 0.8x reducer gives an 0.8x reduction in magnification, showing a wider area in the image, so you can include a larger object in the field of view on your camera sensor.
3 Reduces exposure times: Additionally, the focal ratio of the telescope is also reduced, and that in turn reduces exposure times. For example, with an 0.8x reducer, an F7 scope exposing an image at 100 seconds becomes a "faster" F5.6 scope, allowing an equivalent exposure time of 64 seconds, all else being equal.
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