Cold mirror makes hot astrophotos a snap
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Astrophoto of M31, the Andromeda Galaxy, taken with an 85mm (3.35 in) diameter Takahashi apochromatic refractor and Innovation Foresight's new ON-Axis Guider (ONAG)
Two astrophotos of M51, the Whirlpool Galaxy. The left astrophoto was taken by a 32 cm (12.5") reflector using the ONAG, while the right astrophoto was taken by the Hubble Space Telescope (Photo: Frank Colosimo via Innovations Foresight and NASA)
Astrophoto of M57, the Ring Nebula, clearly showing intense hydrogen-alpha emissions. Taken with an 28 cm (11 in) Schmidt-Cassegrain scope using the ONAG
Closeup of the ONAG attached to a telescope
The Innovations Foresight ONAG showing the guiding camera adjustments on the right
The Innovations Foresight ONAG with an assortment of adapters
ONAG with a guiding camera and a cooled CCD imaging camera mounted on a Hyperion 32 cm (2.5 in) Hyperion reflector (Photo: Frank Colosimo via Innovations Foresight)
The ONAG, an imaging camera (top), and a guiding camera (blue) installed on a Celestron C-8 catadiopetric telescope
The ONAG's cold mirror separates visual light for imaging and NIR light from guiding
Article Summary
While nearly everyone enjoys a good astrophoto, the precision with which the astrograph (the telescope taking the photograph) must follow the stars is not widely appreciated. To take a good astrophoto of any but the brightest objects requires following their motion through the sky accurately. There are a number of approaches toward addressing this problem in the digital era. Perhaps the best option has now been enabled by Innovations Foresight's new ON-Axis Guider (ONAG).
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