Celestron 21080, 21080-AL, 21075, 21075-AL, 21011 User Manual

Firstscope 70 AZ Firstscope 80 AZ

C102 - AZ

Refracting Telescopes

INSTRUCTION MANUAL

Models #21080 and 21080-AL Models #21075 and 21075-AL Model #21011

A SSEMBLING YOUR TELESCOPE

F I R S T S C O P E A Z T E L E S C O P E

The Firstscope AZ is a refractor telescope offered on an Altazimuth mount. The C102-AZ is similar to the Firstscope AZ and all text referred to in this manual on the Firstscope AZ applies equally to the C102-AZ. The telescope is shipped in one box which contains the optical tube, altazimuth mount and all the standard accessories, which include:

Unpacking Your Firstscope AZ

Setting Up the Wood Tripod

• 25mm SMA

• 6mm F Ocular 1-1/4" (150x) - with 70mm only

• 20mm Plossl Ocular 1-1/4" (50x) - with 102mm only

• 6x30 Finderscope (for the 80mm and 102mm); 5x24 (for the 70mm)

• 45° Erect Image Diagonal 1-1/4"

• Slow Motion Controls

• Adjustable Wood Tripod (some models have an aluminum tripod)

Use the accompanying diagram (on page 3) to identify the various parts of your telescope for assembly and ongoing use.

When setting up the telescope, find a large, clear area where the parts can be laid out. Remove the contents of the box and place them neatly on your work surface. Once your refractor has been unpacked and assembled, you will not need the boxes for everyday storage and transportation. However, you should save the box in case you need to ship your telescope via a common carrier.

To begin setting up your Firstscope AZ, start with the tripod and work up from there.

Locate the Altazimuth mount and the tripod legs along with the tripod mounting hardware and the tripod accessory tray.

1. Lie the tripod head on its side. Attach the three tripod legs one by one on the tripod head with the bolts and wing nuts. Do not overtighten the bolts but just make them finger tight. Remember to have each tripod leg in the right orientation with the tripod tray bracket facing inward.

Ocular 1-1/4" (36x) - with 70mm and 80mm models

Setting Up the Aluminum Tripod

2. Now set the tripod with the Altazimuth mount attached in the standing position by speading the legs apart far enough for the tripod accessory tray to fit.

3. You are now ready to install the tripod accessory tray. The tripod tray bracket fits into the holes in the bottom of the tray (use the slots on the end of the brackets). Use the bolts and wing nuts to attach each bracket to the tray.

4. Tighten all bolts and wing nuts to ensure proper stability.

If your model has the Aluminum Tripod:

1. Attach the legs to the tripod head as above.

2. Spread the legs apart.

F I R S T S C O P E A Z

Figure 2-1

The Firstscope AZ fully assembled. Use this illustration and others throughout this manual, to familiarize yourself with the various parts of your Firstscope AZ telescope.

3. Attach the accessory tray to the leg braces. With the tripod set up, you can adjust the height of the tripod. To do this:

Adjusting the Tripod Height

1. Loosen the wing nuts on the lower portion of the tripod leg.

2. Slide the center slat of the leg away from the tripod head until at the desired height.

3. Tighten the wing nut (completely) to hold the leg firmly in place. A wrench is provided to hold the bolt in place while you are turning the wing nut.

Repeat this process for each tripod leg.

Attaching the Slow Motion Control Knobs

Figure 2-2

This illustration shows the correct orientation of the metal sleeve relative to the slow motion shaft.

You are ready to attach the slow motion control knobs.

1. Retract the set screw on the metal sleeve of the slow motion control knobs until it no longer extends into the inner diameter. The metal sleeve is on the opposite end of the cable from the slow motion knob.

2. Slide the end of the metal sleeve over one of the two shafts protruding from the mount. Make sure that the set screw on the metal sleeve is over the flat part of the shaft (see figure 2-2).

The shaft on the right side of the telescope platform controls altitude adjustments while the one on the left controls azimuth adjustments (see figure 2-3).

Attaching the Telescope to the Mount

Figure 2-3

3. Tighten the set screws to hold the slow motion control cables in place.

The optical tube is held to the mount with two mounting rings. On the bottom of the mounting rings are square extrusions — one on each ring. This portion of the ring slides over part of the mounting platform to hold the telescope in place.

1. Slightly loosen the screws that hold the mounting rings on the telescope in place.

2. Slide the rings apart so that each is toward a different end of the telescope. Ideally, the mounting rings should be slightly farther apart than the length of the mounting platform.

3. Place the telescope tube on the mount and orient it so that the objective

lens is opposite the slow motion control handles.

4. Slide the rings together until the square extrusions fit over the ends of the

mounting platform.

5. Tighten the bolt on the square extrusion on the ring closest to the objective

lens to hold the telescope to the mount (C). This knob is on the opposite side of the mounting ring from the hand tightening knob.

6. Tighten the screws that hold the mounting rings in place (A and B). This

will keep the telescope from sliding back and forth in the mounting rings.

Pointing the AZ Telescope

Figure 2-4

Orient the altazimuth mount so that it is parallel to the ground while mounting the telescope tube.

The Altazimuth mount can be moved in two directions; vertically, which is called altitude and horizontally, which is called azimuth.

Altitude

• For major directional changes in altitude, hold the end of the telescope

tube and move the telescope to the desired orientation.

• For fine adjustments in altitude, turn the slow motion control knob on the

right side of the mount. Turning the knob clockwise lowers the angle at which the telescope is aiming while turning it counterclockwise raises the angle at which the telescope is aiming.

Azimuth

• For major directional changes in azimuth, loosen the azimuth tension knob

on the right side of the mount. (This knob is already attached to the mount and does NOT need to be installed.) Once loose, point the telescope to the desired area and tighten the azimuth tension knob.

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