SHARPSTAR SCA260 Ashperical Cassegrain Astrograph with Integrated Field Flattener Instruction Manual

SHARPSTAR SCA260 Ashperical Cassegrain Astrograph with Integrated Field

Flattener

Product Information

• Product Name: Sharp Star SCA260F5
• Manufacturer: Sharpstar
• Model: SCA260F5
• Package Contents: Collimation eyepiece, 4mm hexagonal spanner, 5mm hexagonal spanner

Product Usage Instructions

Collimation:

1. Install the collimation eyepiece in the direction shown in the picture.
2. Observe through the eyepiece and check if it matches the expected patterns. If not, adjustment is needed.
3. Use the included 4mm hexagonal spanner to adjust the three screws of the secondary mirror until it is aligned properly. Be cautious not to over-tighten the screws to avoid damage to the secondary mirror.

Primary Mirror Adjustment

1. Prepare by aligning the astrograph to a bright star or an artificial star point.
2. Rotate the fine adjustment handwheel and compare the star with the provided patterns for in-focus and out-of-focus views.
3. If the star does not match the expected patterns, unscrew the three screws as shown in the picture using a 4mm hexagonal spanner.
4. Use the 5mm hexagonal spanner to adjust the three primary mirror adjusting screws to move the star to the right position.
5. Adjust the three screws to move the star towards the wider side of the diffraction ring, towards the edge of the frame.
6. Adjust the equatorial or longitudinal mount to move the star to the center of the frame and check if it looks the same as in the previous step.
7. If it still differs, repeat the previous step until the desired alignment is achieved.
8. Once finished, lock the three screws to secure the collimation.

Thank you for choosing Sharpstar astrographs Please carefully read the instructions for adjustment before usage (Tool you need to prepare: M48×0.75 to 1.25 adapter)

Install the Collimation Eyepiece

Finish Installing

Collimation of the Secondary Mirror

1. Observe through the eyepiece, and you will see as follows: (If different, go ③.)
2. If it is different from①, there will be patterns as follows. It means an adjustment is needed.
3. Use the included 4mm hxagonal spanner to adjust the three screws of the secondary mirror until it is good.

(Use the long side of the hexagonal spanner to adjust. Do not over-lock the screws, or it will cause irreversible damage to the secondary mirror.)

Collimation of the Primary Mirror

Preparation:

1. Dismantle the M48×0.75 to 1.25″ adapter and the collimation eyepiece
2. Install an eyepiece or a camera and get it focused.
3. Mount the astrograph onto an equatorial or longitudinal mount, and align the astrograph to a bright star or an artificial star point.
4. Rotate the fine adjustment handwheel and compare the star with the follow patterns.
5. If it looks like these patterns, the primary mirror needs adjustment.
6. Unscrew the three screws as the picture shows
7. Screw the three primary mirror-adjusting screws to move the star to the right position.
8. Adjust the three screws to move the star towards the direction of the wider side of the diffraction ring to the edge of the frame.
9. Adjust the equatorial or longitudinal mount to move the star to the center of the frame and see whether the star looks the same as that in Step ①.
10. If it still differs from Step ①, repeat Step ⑤&⑥ until finished.
11. Lock the three screws in Step③ and finish collimation.

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