10" f/4 true astrograph (Patrick Stevenson)

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10" f/4 true astrograph

It is finished and ready for first-light! Unless there is someone hiding out there in seclusion, this is the only true 10" f/4 astrograph in existence. Donor telescope was TS Photon for optics and hardware. Many modifications were done: Extended tube, larger secondary, black velvet flock entire internal tube. Equipped with an ASI294MC Pro camera, TS-Optics NEWTON Coma Corrector 1.0x TSGPU Superflat - 4-element, ZWO EAF focuser, ASIair Pro, 60mm helical guide scope.

In the past I used the Orion 10" f/3.9 astrograph and noticed a slight difference between that and a 10" f/4 Orion observing scope. I became interested to see if there really would be a significant difference with a true astrograph. I researched the difference between a "normal" observing telescope and an astrograph. I decided to build one that utilized all the details in design and operation. I found, in my research, that flocking the entire tube, along with the extended length, would equal the performance of using baffles. It was a difficult decision until I found out how much it would cost to machine a set of nine baffles.

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Cloudy Nights

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	Distinct awarded users	Total awarded images
Image of the day
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Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
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Northern lights
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This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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10" f/4 true astrograph

10" f/4 true astrograph

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10" f/4 true astrograph

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