5"diameter Heat Absorbing Glass specifically for the Omega ProLab D-6 Zoom Condenser lamphouse. This glass is specially sized to sit on the three clips on the inside top of the zoom lamphousing. Heat absorbing glass eliminates much of the infrared radiation from the light produced by the enlarging lamp, thus helping to protect filters and negatives from heat damage, and reducing the chance of negative "popping" which affects focus.
