Sony E-Mount Slim T-Ring M42 Stellarvue extra-low-dispersion lanthanum glass elements to

extra-low-dispersion lanthanum glass elements to produce a well-balanced image with minimal aberrations

Large 80mm Objective Lens for a Bright Image Field

Periodic error is controlled within plus or minus 10 arcseconds

Omega (M17)

178 seconds on a 60 mm

Sony E-Mount Slim T-Ring M42 Stellarvue extra-low-dispersion lanthanum glass elements toSlim, short, or "T Minus" rings get their name from the fact that they are shorter than the "T2" standard but still have the same 42mm (. 75 pitch) threads. Normal T Rings for mirrorless cameras are typically 30 38mm deep. These slim "T Minus" rings are only 10mm deep. Fits ALL Sony "E" Mount "Mirrorless" Cameras.