ZEISS Astro Adapter for ZEISS Conquest Gavia 85

ZEISS Astro Adapter for ZEISS Conquest Gavia 85

Specially for stargazers: the ZEISS Conquest Gavia.

The adapter enables standard astro eyepieces to be mounted on the Conquest Gavia. Available as 1.25" connector.

Possible magnifications, exit pupils and true fields of view

The magnification is calculated from the formula magnification=494 mm / focal length of eypiece in mm

Then, the exit pupil is calculated from the formula EP=85 mm / magnification

And the true field of view in degrees is calculated according to tfov=eyepiece field of view / magnification

If the magnification is too high, the image will deteriorate, if the exit pupil is too large, not all of the light will hit the eye.

The focal length of the eypiece should not be significantly less then 8 mm, the maximum focal length depends on how large your pupils can get under different observing conditions. There are tables in the internet showing the eye´s pupil size, but they are only a coarse guide.

As a rule of thumb, the pupil stays 8 mm wide until age 20, then you have to subtract 1 mm for every decade, and the minimum is 2.5 mm.

Safety informations: PDF Download