Special laser optical filter 750nm bandpass (unknown brand) Description: no longer needed in my lab. I have not full information (only bandpass), but you may know enough of it given this information. Tests done with "mirror side" facing light source. Measures: Mount is exactly 1" 25,4mm (filter a bit smaller to fit in mount). Thickness is 0,246" (6,24mm). Catalog number and other info: 750 3C S-LAB 1-1 (this last number might be the cut-on cut-off tolerances in nm) Straight light-through behaviour (0º angle): LED HALOGEN light source show DEEP RED. Edge-on light-through behaviour through HALOGEN light source (around 80º angle): LIGHT RED. Weight: 5,8gr. Condition: filter shows nice. No scratches or haze. I would say EXCELLENT OVERALL condition. Delivered in original package. Shipping: Remember I combine shipping. Ask for invoice (through) BEFORE paying if I didn't send it to you yet!)