DayStar Filters QUARK Snelstarthandleiding - Pagina 6

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Eyepiece Selection:

Daystar Recommends Tele Vue Plossl series

eyepieces of 25mm, 32mm, and 40mm.

Remember t hat at F/30, a high powered eyepi ece

can exceed Dawes' limit. Observers will find best

results with a n eyepie ce which i s 32 mm or g reater

to avoid this.

Eyepieces of higher power will result

in a 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 an d oth er "fa st" eye pieces

typically perform very badly on DayStar applications.

Other brands do offer Plossl eye pieces in 32-40mm and they can give a

respectable performance in lieu of a Tele Vue.

We have al so found

some of the very old wide field

"Erfle" eyepieces aren't ba d for a n

experienced observer.

I t sho uld be noted th at re peatedly i n side-by-

side tests, we found Tele Vue brand Plossl eyepieces to offer the highest

contrast, m ost even view and wid est exit pupil.

In Solar Observing,

contrast is achieved by co ntrol of scattering. Tele Vue Plossl s stand out

in superior design. Furthermore, the adjustable eye cup offers a dditional

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 re sults 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 ove r your he ad t o limit the

stray light tha t enters yo ur 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 l onger periods so a s to pi ck out mo re subtle detail s on the

surface of the Sun.