Tinman, ...And why are your
TM 2000 lens prices
The Tinman Respondeth:
The glass is made in small runs in platinum-lined ovens. Precision is necessary to prevent flaws from a glass
inherently unstable, as seeds, flaws, and other nasties await.
The glass is made in ingots or slabs which are then ground down to the necessary dimensions. Cheaper glass is
floated in thin sheets, cut, and then ground.
Also, think of our requirements: Precise bandpass to limit color transmittance, accurate shading and impact
resistance, accurately limited blue, infra red, and ultraviolet light transmittances, with nice clarity
and correct size. Not the $5 smoked glass filter plates from the local hardware store's welding supply,
but still a rather nice product!