The Altair Solar Wedge has been fully tested with the sun remaining in the centre of the field of view for 4 hours of continual use centred on the sun with a 180mm aperture refractor telescope in mid-summer from 11:00 – 14:00, cloudless sky.

At no point did the outer prism housing become too hot to touch, a problem common with other cheap copies and other makes of solar wedges which do not have the same prism coatings and heat dispersion measures employed by the Altair Solar Wedges.

However, if your refractor telescope is larger, then we suggest trying the wedge for a short time initially, to assess the heat build-up and make your own informed decision.

For usage tips, please also refer to the Altair solar wedge instruction manuals here.