Boren-Simon 8" f/3.6 PowerNewton Astrograph

With the Boren-Simon PowerNewtonian, you can take extremely deep astrophotographs within just one night.

Due to the reducer/corrector, you can enjoy the amazing performance with great sharpness and no reflection problems. You can gather enough raw material for the truly ultimate photograph of an object in one night!

The advantages of the 8" f/3.6 PowerNewtonian:

Short exposure times at f/3.6 - perfect also for cameras without cooling

No colour shift at the edge when using narrowband filters

Higher resolution due to higher focal length

Very good field correction thanks to the corrector/reducer

High mechanical stability due to the carbon tube

Weight of only 7.6 kg - can still be carried by portable mounts

Back Focus 65 mm starting from the T2-thread - also suitable for OAG

Fully illuminated and corrected field for APS-C format sensors

Only 35% obstruction - suited for visual use

The advantages of the 8" f/2.6 Astrograph against Celestrons Hyperstar system

The camera sits at the side of the tube, not in the middle and in front of the instrument. You don´t suffer from the waste heat of the camera.

The system itself is open and cools down faster and is also less affected by dew problems.

The Astrograph offers a larger working distance than the Hyperstar and therefore you can use CCD cameras and filter wheels.

The TS UNCN2 V-Power focuser:

One of the central parts of the TS PowerNewtonians is the modern UNCN2 focuser. The focuser can carry larger cameras and payloads without flexion problems. Only by using that low profile focuser we were able to modify the focus position.
Even at f/3.6, we can still use a secondary mirror of only 70 mm, which reduces obstruction. More features and advantages:

fantastic stability at an extremely short overall length

stable enough for all common coma correctors and accessories, like off-axis guider or filter wheel

precise 1:10 dual speed - for perfectly focused images

Motorfocus optional - with TSACUMOTORFOK

Illumination and correction of the 8" f/3.6 Astrograph:

The backfocus of the 8" f/3.6 PowerNewtonian is 65 mm. The popular Kodak KAF8300 sensor is being fully illuminated and corrected. even DSLR cameras with the APS-C sensors can be used with the instrument and by using a flatfield correction you get rid of any vignetting left.

Switch from fast f/3.6 to high-resolution f/5 in minutes with the TS MAXFIELD corrector:

One telescope, two focal lengths - this is also possible with the Boren-Simon astrograph. With the optional TS MAXFIELD coma corrector, you can turn the fast f/3.6 astrograph into a high-resolution astrophotographically corrected Newtonian telescope with the focal ratio of 1:5 and 1000 mm focal length.

The conversion is done within a few minutes and the collimation is fully preserved.

The focus position at the Boren Simon is optimized for the TS2KORRR reducer corrector with about 90 mm above the 2" plug-in sleeve of the focuser. The corrector needs this because of the focal length reducing effect. We recommend the BA2957031 spacer sleeve for the TS MAXFIELD ( TSKomakorr ). This sleeve comes between the focuser and the connection plate on the tube. This moves the focuser 19mm away from the tube.

[The secondary of the Boren Simon is optimized to fully illuminate one field lens of the corrector. Whether this is the TS Maxfield or the TS2KORRR reducer is not important. In both cases the illumination is limited by the corrector itself (diameter telescope side lens - distance to sensor). So any Boren Simon can do well with the GPU. A flat is of course always recommended, both with the Maxfield and with TS2KORRR.

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin

Astrophotographic results obtained with this telescope on Astrobin

Here you can find some astrophotographs made with this telescope model: Link to Astrobin


M33 through BS8LED

Photographer: Peter Adamietz

Telescope: Boren Simon 8" f/3,6 Newtonian

Corrector: ASA 2" Reducer Correktor

Camera: G2-8300 Moravian mono CCD

Exposure: each 4x240 seconds (L-RGB)

Mount: Losmandy G-11

Answer from Teleskop-Service:
How do I get to 55mm working distance??]
[!This is quite simple - always from the corrector to the camera:

distance 55mm with T2 connection:

Tuning ring M48AbstimmA1
TSVF205
TSM48-T2L

Distance 55mm with M48 connection:

Tuning ring M48AbstimmA1
TSVF210
Tuning ring M48AbstimmA1