Feature

●William Optics New Design Vertical Mask, Focusing Mask, Compatible Diameter 105-148mm
●By attaching this product to the front of the telescope or camera lens, it is possible to accurately adjust the focus
●The new design makes it easy to adjust light reflection (spike analysis) about 3 times more bright than traditional vertinov mask
●[Mounting outer diameter range] 4.1 - 5.8 inches (105 - 148 mm) *Mounting outer diameter is not a lens aperture but also an outer diameter of the hood to be installed


Description

WilliamOptics New Vertinov Mask

By attaching this product to the front of the telescope or camera lens, it is possible to accurately adjust the focus.

The new design makes it easy to adjust light reflection (spike analysis) about 3 times more bright than traditional vertinov mask.

[Mounting outer diameter range] 4.1 - 5.8 inches (105 - 148 mm)
The outer diameter of the mount is not a lens aperture and is an outer diameter of the hood to be attached to.