Telescope Objectives

Select the required parameters and click ‘request quote’ to autofill the form at the bottom right of this page, then fill out your email address and we will get directly into contact with you. This tool is to give us a general idea of what you require, the final specifications can only be reached after discussing the various options and deciding on more detailed parameters after reviewing design performance, optical substrate, etc.

When our standard range of refractors doesn’t meet your requirements you may use this tool to submit an inquiry for a custom built lens cell.

Lens cell typeChoice of 2, 3 or 4 optical elements in the lens cell. More elements means better correction, generally speaking, for more information please get in touch.
Optical designSpherical elements are easier to produce and will cost less however for larger apertures aspheric surfaces will give better correction albeit at a higher cost, recommended for apertures over 150 mm.
ApertureThe full unobstructed aperture of the lens cell
Focal ratioChoose from f/5 to f/12
System qualityRequired optical performance choice of 0.92, 0.95 or 0.97 strehl
Imaging circleThe required fully corrected and fully illuminated imaging circle. Choices are for APS-C, 35 mm or 50 mm square sensor formats.