TS-Optics 8" f/12 Hyperbolic Cassegrain telescopes are excellent high contrast and optically sharp instruments, particularly well suited for lunar and planetary viewing and imaging.
In terms of optical quality, Cassegrain telescopes are traditionally more advantageous than other similar designs such as SCT's which generally contain more basic spherical mirrors and a larger central obstruction. Being an open ended system, similar to Newtonian designs, these cassegrains are also less susceptible to dew formation and also adapt to temperature changes much more quickly.
Advantages of the TS-Optics Cassegrain design:
Well corrected field due to parabolic primary and hyperbolic secondary mirror with less field curvature compared with other cassegrain designs.
These are a pure reflection system without a Schmidt plate, resulting in better sharpness as well as the possibility for IR Photography
Significantly quicker temperature adaption thanks to Newtonian style open ended design.
Brighter image due to 96% dielectric coating on primary and secondary mirror.
No mirror shifting while focusing, because the primary mirror is fixed.
Includes a high-quality 2" Crayford focuser with micro-gear reduction and compression rings for 2" and 1.25" accessories
Only 33% obstruction caused by secondary mirror.
Better sharpness on the optical axis due to precise mirror surfaces and the lack of a front plate
Several interior baffles for even higher image contrast
Generous backfocus allowing the use of 2" accessories.
Compact tube with only 580mm length - so can be operated with smaller mounts
Primary and secondary mirrors are adjustable
Optics: Cassegrain optics with parabolic primary and hyperbolic secondary mirror
Aperture: 203 mm (8")
Focal length: 2436mm
Colimation aid: Central marks on the secondary mirror for easier collimation
Suitable for Infrared photography: yes
Backfocus: Roughly 150mm from the 2" receptacle
OTA diameter: 230 mm
OTA length: Approx 620mm
Weight: 8.2 kg
Secondary mirror obstruction: 33% (linear)
Focuser: 2" Crayford focuser with micro-gear reduction
Connection thread of the focuser: M90x1 on the tube
Dual Dovetail: Vixen/EQ5 + Losmandy style
8" f/12 Cassegrain OTA
2" focuser with reduction to 1.25"
Dust protection cap for the focuser and front aperture
Finder shoe (mounted)
M90 extension tubes
Please Note: Items in stock and ready for dispatch immediately are usually delivered within 24-48hrs. Some items may be 'Special Order Items' and require additional lead time before being dispatched eg. 5 - 10 Working days - This will be highlighted on the product page before purchase.
All orders are shipped using our reputable courier partners to ensure your items arrive safely and promptly. While we do offer International Delivery, we are unable to ship large Telescopes and Mounts outside of Ireland.
REPUBLIC OF IRELAND
Est. Delivery Time after Dispatch: 24 - 48 hrs
Standard Express Shipping: Ireland Nationwide: from €9.95
Note: Larger telescopes which contain multiple boxes include an additional surcharge. Shipping is calculated automatically at the checkout.
- CLICK & COLLECT -
You can also avail of our FREE 'Click & Collect' service at the checkout, where you can order online and collect from our head office. Depending on the items and availability, these can be ready for collection within a few hours. "NOTE: Please wait until we let you know your order is ready before you arrive, to arrange a suitable time for collection."
Est. Delivery Time after Dispatch: 24 - 48 hrs
Standard Express Shipping: Norther Ireland: from €19.50+
Standard Express Shipping rate applies up to a max order weight of 30kg Nationwide. - Large heavy items from 30kg+ include an additional surcharge, depending on the overall weight.
Unfortunately due to Brexit we are currently unable to ship to Mainland UK at this time.
Est. Delivery Time after Dispatch: 24 - 72 hrs
Standard Express Shipping: European Union: from €18.95+
Shipping available for items upto a max order total weight or volumetric weight of 27kg.
If your country is not listed below please contact us for more information.
Standard EU Delivery Regions: Germany, France, Belgium, Poland, Luxumbourg, Netherlands, Sweden, Denmark, Portugal, Spain, Austria, Italy, Poland, Czech Republic, Croatia, Malta, Greece
US & CANADA
Est. Delivery Time after Dispatch: 48 - 72 hrs
Standard Express Shipping: US & Canada: from €28.50+
Shipping service available for items upto a max order total weight or volumetric weight of 20kg.
* Customs / Import duties may apply in these regions. For more information please contact your local tax/customs office.
IMPORTANT: Its essential that when placing an order, you include a valid 'Contact Telephone Number' for the delivery address or for the person receiving the item. This is necessary to avoid potential delays or problems with your delivery.
Please Note: Delivery times listed above are estimated. These are calculated from when your order is Completed & Dispatched (not from when the order is placed) and times may also vary for some remote post codes. Delivery service takes place Mon-Fri (excl. Bank/Public Holidays).
Shipping Disclaimer: All of our parcels are sent via a 3rd party registered courier service to ensure safe and prompt delivery. While we endeavor to ensure that all parcels are delivered within the specified time frame, 'Horizon Astronomy' can not be held responsible for delays due to adverse weather conditions or other courier/technical related issues outside of our control.