Optional Accessories - Celestron STAR HOPPER Instruction Manual

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Table Of Contents

Table of Contents

Barlow Lenses

A Barlow lens is a lens that, when used with any eyepiece, doubles the magnification of that eyepiece by

increasing its effective focal length. Celestron offers two Barlow lenses in the 1-1/4" size. The 2x Ultima

Barlow (#93506) is a compact triplet design that is fully multicoated for maximum light transmission and

parfocal when used with the Ultima eyepieces. The 2x Ultima works very well with all Celestron

eyepieces. The latest Barlow to be added to Celestron's product line (#93507) is a low profile achromatic

design. It weighs just 4 oz. and is under 3" in length.

Eyepiece Filters

These filters are an invaluable aid in lunar and planetary observations. They reduce glare and light

scattering; increase contrast, definition and resolution; reduce irradiation and lessen eye fatigue.

Celestron offers a wide range of colored filters that thread onto the 1-1/4" oculars. Available are: #12

Deep Yellow, #21 Orange, #25 Red, #58 Green, #80A Light Blue, #96 Neutral Density (25% T and 13%

T), and Polarizing filters. Filters are also available in sets of four (#94118 - Series 1-4).

Eyepieces

Like telescopes, eyepieces come in a variety of designs, and Celestron offers an excellent selection of

designs, each with its own advantages. For the 1-1/4" barrel diameter there are four different eyepiece

designs available.

•

Plössl - Plössl eyepieces have a 4-element lens designed for low-to-high power observing. The Plössls

offer razor sharp views across the entire field of view, even at the edges. In the 1-1/4" barrel

diameter, they are available in the following focal lengths: 6.3mm, 7.5mm, 10mm, 12.5mm, 17mm,

20mm, 26mm, 32mm, and 40mm.

•

Ultima - Ultima is Celestron's top of the line eyepiece, using a hybrid design of four to seven

different elements. Featuring long eye relief and a wide field of view, these eyepieces are fully

multicoated on each air-to-glass surface to enhance contrast levels. Each eyepiece is designed by

computer to reduce optical aberrations to the absolute minimum. In the 1-1/4" barrel diameter, they

are available in the following focal lengths: 5mm, 7.5mm, 12.5mm, 18mm, 24mm, 30mm, 35mm

and 42mm. These eyepieces are all parfocal.

•

Lanthanum Eyepieces (LV Series) - Lanthanum is a unique, rare earth glass used in one of the field

lenses of this new eyepiece. Use of this special glass reduces optical aberrations to a minimum. All

lenses are fully multicoated and have an astounding 20mm of eye relief—perfect for eyeglass wearers!

In the 1-1/4" barrel diameter, they are available in the following focal lengths: 2.5mm, 4mm, 5mm,

6mm, 9mm, 10mm, 12mm, 15mm, and a 8-24 zoom.

SMA Series - high quality yet economical 6mm, 10mm and 12mm eyepieces designed to offer a wide

•

field of view.

In addition, a deluxe compact zoom ocular (#93306) with variable focal length of 6.5 to 18mm is

available. It provides a range of 68-188 power on the Star Hopper

Star Hopper

4½.

Flashlights

Celestron's #93592 and #93588 night vision red LED (light emitting diode) flashlights conveniently

allow you to read star maps without diminishing your night vision. Both feature adjustable brightness and

are small and lightweight, (#93592 is only 6 inches long, and weighs in at a mere 3 ounces).

Light Pollution Reduction (LPR) Filter (#94126A)

A 1

" filter that threads onto a 1

objects when observed from urban areas. The LPR filter selectively reduces the transmission of certain