Please note that optical sets, or complete telescopes, are only sold following on-sky acceptance with the customer. This can be undertaken at our facility, or at the customers requested location (subject to transportation costs to the site of their choice). The performance of optical sets can be demonstrated in telescope test rigs that we have. Interferometry test results can be supplied at extra cost (please contact us to discuss).

​Normally a 50% deposit is required on placement of a new order (optical sets or complete telescopes) with the balance payable following acceptance. No deposit is required for optical systems that are finished and listed below and which can be visually inspected and demonstrated on-sky at our facility (prior to purchasing). Costs will be requested for inspection and on-sky demonstration of stock items listed below at the location of the customer's choice.

Payment methods can be discussed when you contact us. Delivery timescales and costs for new optical systems ordered will be dependent on exchange rates and lead time for the supply of the optical blanks. TTL produce bespoke optical sets and do not mass manufacture.

Please contact us for more information, or to discuss any of the items listed in stock below or your own specific requirements. Please note that VAT has now been removed from our prices.

610mm diameter primary mirror blank for sale (Number 001)
Primary F Ratio: F3
Diameter: 610mm
Thickness: 45mm
Substrate: Supremax 33 fine annealed
Coating: Non - Fine ground to 800 grade
Price: £4000 +Delivery​

760mm diameter primary mirror for sale (Number 001)
Primary F Ratio: F3
Diameter: 760mm
Thickness: 53mm
Substrate: Supremax 33 fine annealed
Coating: Protected Aluminium
Price: SOLD

200mm minor axis secondary mirror for sale (ideal for the 760mm diameter F3 primary)
Minor axis: 200mm
Substrate: Plate 25mm thick
Coating: Hi-Lux
Price: £800 +Delivery​

200mm minor axis secondary mirror for sale (38mm thick)
Minor axis: 200mm
Substrate: Plate 38mm thick
Coating: Hi-Lux
Price: £1000 +Delivery​

300mm precision round flat for sale
Diameter: 300mm
Thickness: 50mm
Substrate: Pyrex
Coating: Hi-Lux
Price: £4000 +Delivery

760mm diameter primary mirror blank (Number 002)
Primary F Ratio: F3
Diameter: 760mm
Thickness: 52mm
Substrate: Supremax 33 fine annealed
Coating: None - Surfce generated to 400 grade
Surface: Diamond generated ready for fine grinding
Price: £4000 +Delivery

760mm diameter primary mirror blank (Number 003)
Primary F Ratio: F3
Diameter: 760mm
Thickness: 52mm
Substrate: Supremax 33 fine annealed
Coating: None - Surface generated to 400 grade
Surface: Diamond generated ready for fine grinding
Price: £4000 +Delivery