DayStar Filters SolaREDi 66 Podręcznik - Strona 4

Przeglądaj online lub pobierz pdf Podręcznik dla Teleskop DayStar Filters SolaREDi 66. DayStar Filters SolaREDi 66 17 stron.

Eyepiece Selection:

Daystar Recommends Tele Vue Plossl series

eyepieces of 15 to 32mm focal length.

Remember that at F/14, a high powered eyepiece

can exceed Dawes' limit. Observers will find best

results with an eyepiece which is 15mm or greater.

Eyepieces of higher power will result in a dim, fuzzy

disk without the ability to focus well.

We have tested a number of eyepieces over the years. We performed a

comprehensive eyepiece comparison between various brand names and

eyepiece styles.

Naglers, zooms, radians and other "fast" eyepieces

typically perform very badly on DayStar applications.

Other brands do offer Plossl eyepieces and they can give a respectable

performance in lieu of a Tele Vue. We have also found some of the very

old wide field "Erfle" eyepieces aren't bad for an experienced observer.

It should be noted that repeatedly in side-by-side tests, we found Tele

Vue brand Plossl eyepieces to offer the highest contrast, most even view

and widest exit pupil. In Solar Observing, contrast is achieved by control

of scattering. Tele Vue Plossls stand out in superior design.

Furthermore, the adjustable eye cup offers additional contrast by

allowing the user to dark adapt during sunny days.

Eyepiece features we found to increase performance include:

- "Fully Multicoated" - Of those eyepieces which did better than others,

those marked "fully multicoated" offered better views from less internal

scattering.

- Blackened optical edges - Tele Vue and other eyepieces which

performed better all had blackened edges of their optical elements. This

also reduces internal scattering within the eyepiece.

Maximizing the viewing experience:

Daytime viewing results in stray light entering your eye that can make it

hard to see through the filter. We recommend a viewing hood or cloth be

placed over your head to limit the stray light that enters your eye,

allowing fainter prominences and more surface detail to be observed. A

comfortable chair also improves the experience, allowing the eye to stay

steady for longer periods so as to pick out more subtle details on the

surface of the Sun.