Dual OTA Mode
Fig 37: Dual OTA Alt-Az
The LX80’s sectional counterweight shaft is designed to accept a secondary dovetail adapter enabling you to mount a second optical tube assembly. This offers you the versatility and convenience of having two different optical systems mounted and ready for use at the same time. This is perfect for public outreach events where dual OTAs allow for multiple viewing of the same object. LX80’s unique design allows for a total combined instrument weight of up to 70 pounds in this configuration.
The secondary OTA will need to be equipped with a securely mounted “Vixen®” style dovetail. This OTA dovetail is not included and will need to be purchased separately and mounted to your secondary OTA.
Begin by configuring the mount in the
1Lock the RA and DEC clutches (Page 8, Fig 1, 29 and 30) so the primary optical tube is stationary.
2.Before beginning the next step it is advised to enlist the help of a second individual to steady the primary OTA. Both the counterweight and/or sections of the counterweight shaft may be removed and doing so will unbalance the telescope. Having someone steady the mount while this is being done will ensure that the
3.Locate the included secondary dovetail adapter (Fig 38). Note the adapters’ two hex head attaching screws. Inspect the adapter mounting hole and verify the attaching screws are sufficiently screwed back allowing it to fit onto the counterweight shaft. You may need to back the attaching screws out using the LX80 tool if necessary. Next slip the dovetail adapter onto the counterweight shaft. Position the dovetail adapter all the way onto the shaft so the attaching screws tighten into the recessed channel at the end of the counterweight shaft. Position the secondary adapter so it is at the same angle as the primary OTA dovetail adapter and tighten to a “snug” fit using the LX80 tool.
Fig 38: Secondary mount plate
4.Mount the secondary OTA, sliding its dovetail into the secondary dovetail adapter and secure by tightening the two dovetail lock knobs.
5At this point you will need to balance the two OTAs. Refer back to the section “Balancing the OTA” on Page 19 for steps balancing in both DEC and RA axis. Note that to achieve a balance in the RA axis you may need to add additional counterweights and or add extensions to the counterweight shaft. Adding additional counterweight shafts moves the secondary OTAs mass out further which will give it greater counter leverage against the primary OTA.
Balancing the OTAs is especially important when using the LX80 in the dual OTA mode due to the higher weight capacity. A balanced telescope in both the DEC and RA minimizes strain on motors, gearbox and delivers smoothest operation, increasing battery life.
The LX80
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