TMB Optical has been designing optical systems for the amateur and professional market since 1990, including some of the finest true apochromatic refractors available.
By using the most advanced glass types in fully optimized air-spaced triplet designs, we’ve created optical systems that are simultaneously corrected for secondary color spectrum, coma, spherical and higher order aberrations. The result
is a series of telescopes that are a clear step above the performance of the many so-called apochromats that use inferior low dispersion ED glass, or the many
doublet "apochromats" that have a significant violet residual spectrum. These lesser lenses have, at best, only semi-apochromatic performance – not the true apochromatic performance built into every TMB scope.
Our TMB triplet refractors use a very high homogeneity Super ED glass as the center element, full multi-coatings on all six surfaces, a fully temperature compensated lens cell, and zonal correcting non-equal internal radii. Optimizing these elements allow our lenses to satisfy the most serious planetary and deep space observer, as well as the most critical CCD or photographic user.