TS focuser collimation for 6 + 8' RCs by GSO and Astrotech

GSRCJ90

Adapter-Special
in stock

TS focuser collimation for 6 + 8" RCs by GSO and Astrotech

99,00 EUR
incl. 19 % Tax
excl. 6,00 EUR Shipping costs

Description

TS Optics adjusting device for the GSO RC's focuser (for 6 and 8" models)
... allows very precise collimation of GSO RC telescopes and needs only 15mm back focus.

For which purposes is a focuser adjustment needed?
Regarding the focuser's adjustment, we're talking about minimal amounts of tipping. If using a DSLR camera with APS-C sensor (or other CCD cameras up to approx. 23mm sensor diagonal), you won't have any problems with field definition. But if you have a full-frame camera, correcting the focuser can increase off-axis image sharpness.

Mounting the adjusting device is quite easy:
-- remove the focuser
-- screw on the TSRCJ90
-- fix the adjusting device with the small set screws
-- re-attach the focuser.

Technical details:
-- Telescope side: M90x1 female thread
-- Camera side: M90x1 male thread
-- Optical length: 15mm

Useful information by Teleskop-Service: Collimating a RC telescope

We recommend using the TSLA laser collimator. Fix the laser inside the focuser's 1.25" barrel.

Adjusting the focuser:
Adjust the focuser at your new adjusting device until the laser spot lies exactly on the secondary mirror's center mark. It can be seen by looking into the front side of the telescope.

Adjusting the secondary mirror:
The laser beam is reflected by the secondary and you can see the spot on the matte screen of your laser. Now collimate the secondary until the laser beam is reflected into the center bore of the matte screen.

Adjusting the main mirror:
The main mirror is collimated using an artificial or real star. The artificial star by Geoptik is a great help here. Now defocus the star image slightly at approx. 150x magnification. By using the screws on the telescope's back side (push-pull-configuration) adjust until the shadow of the secondary mirror lies in the center of the diffraction rings.

Final collimation:
Tilting the main mirror has effect on the focusers situation. So recapitulate step one "Adjusting the focuser". After this, the RC is adjusted optimally and gives best performance on- and off-axis.

Special service by Teleskop-Service:
If RC telescope and adjusting device are purchased together, we install the collimator for you and adjust the telescope for you on our optical bench without additional costs. We guarantee for optimal collimation.

We recommend following products:

GSRC8C

1.099,00 EUR*

* excl.Shipping costs

GSO 8" f/8 Ritchey-Chrétien - 203/1624mm RC - Carbon tube

GSRC6M

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GSO 6" f/9 Ritchey-Chrétien - 152/1370mm RC - limited offer !!