DayStar Filters SOLAR SCOUT Manuel - Page 6

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Eyepiece Selection:

Daystar Recommends the DayStar 25mm Plossl, or

Tele Vue Plossl series eyepieces of 25mm, 32mm,

and 40mm.

Remember that at long focal ratios, a high powered

eyepiece can exceed Dawes' limit. Observers will

find best results with an eyepiece which is 32mm or

greater 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 and other "fast" eyepieces

typically perform very badly on DayStar applications.

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

respectable performance in lieu of a DayStar or 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. DayStar uses these same designs. 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.

TeleVue Plossl owners who do not use eyeglasses may benefit from the

TeleVue Eyeguard Extender, as the point of best view will be elevated

above the eyepiece cup.