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Scope & Focuser

The APT Settings dialog box is accessible from Tools tab or with Alt+S shortcut.
 
The scope and focuser settings tab contains options related to telescope mount and focuser.
 
Scope & Focuser
1

Auto Connect Scope

1. Auto Connect Scope
 
When enabled on starting, APT will try to make connection to the last used telescope/mount.
 
2

Hide Meridian

Flip Clock

2. Hide Meridian
Flip Clock
 
When enabled the Meridian Flip clock will be visible only when there is active connection to telescope in Gear tab
 
3

Above Horizon

3.  Above Horizon
 
When enabled before any GoTo command, APT will make a check if the target coordinates are above horizon. If the object is below horizon you will be asked to confirm the move.
 
4

LX200 Mount

4. LX200 Mount
 
When enabled will force APT to use the LX200 communication protocol over the ASCOM connection.
 
5

Force GoTo Flip

5. Force GoTo Flip
 
Some mounts support command to change the side of the scope according to the tripod/pier. This command is handy during Automated Meridian Flip, however sometimes the mount refuse the change the side. If such problem occurs, enable this option and SessionCraft will use appropriate GoTo command to complete the task.
 
6

Fast Speed

6. Fast Speed
 
Defines the fast speed of telescope moving (degrees per second) when N/S/E/W buttons are used in the Gear tab. Leave empty to use the default speed. Note that some value may not be supported by the mount or by the driver.
 
7

Slow Speed

7. Slow Speed
 
Defines the slow speed of telescope moving (degrees per second) when N/S/E/W buttons are used in the Gear tab. Leave empty to use the default speed. Note that some value may not be supported by the mount or by the driver.
 
8

Auto Connect Focuser

8.  Auto Connect Focuser
 
When enabled on starting, APT will try to make connection to the last used focuser.
 
9

Meade Focuser

9. Meade Focuser
 
When enabled will show the special section in the Gear tab for using Meade focuser. In this case you don’t need to make a connection using “Connect Focuser” button. Requires APT restart.
 
10

Arduino Focuser

10. Arduino Focuser
 
Enable this option if you are using an Arduino based focuser which has integrated humidity sensor. Requires APT restart.
 
11

Inwards move

11. Inwards move
 
When enabled, every focuser position change will be finished with a move in inwards direction in order to minimize the influence of the backlash or the mirror flopping. To achieve that if the move is outwards, APT makes a bigger move and after that gets back to the desired position from inwards direction. The amount of that move is defined by "Final inwards move steps".
 
12

Backlash Aid

12. Backlash Aid
 
Opens the Backlash Aid. It helps to measure the backlash of Crayford / Rack & Pinion focusers.
 
13

Reverse moves

13. Reverse moves
 
When enabled the will send reversed Inward/Outward commands.
 
14

Inwards backlash

14. Inwards backlash
 
Defines now many position steps is the inwards backlash of the focuser that has to be compensated when focuser changes the move direction from outwards to inwards. 0 means no backlash.
 
15

Outwards Backlash

15. Outwards Backlash
 
Defines now many position steps is the outwards backlash of the focuser that has to be compensated when focuser changes the move direction inwards from to outwards. 0 means no backlash.
 
16

Internal Counter

16. Internal Counter
 
Enable this option if you want to hide the backlash compensation moves from the focuser position. In this case APT will use its own position counter and its value will be visible in the Gear tab. When is disabled position value will include the backlash moves.
 
17

Flop Correction

17. Flop Correction
 
When enabled the inward and/or outward backlash define what moves are needed to compensate the mirror flop of Schmidt-Cassegrain / Maksutov telescopes when focuser changes the move direction.
 
18

Emulate Positions

18. Emulate Positions
 
Enable this option if you have focuser that doesn't support positions. APT will emulate positions focuser.
 
19

Remember Position

19.  Remember Position
 
When enabled APT will remember the emulated position value between the session. It is useful for permanent setup.
 
20

Step emulation

20. Step emulation
 
Defines how many steps/pulses will correspond to one emulated focuser position.
 
21

Temperature Compensation

21. Temperature Compensation
 
Enables the temperature compensation. It helps to compensate the focus point changes cased by the changes in the ambient temperature. Note that temperature compensations will not be applied when Focusing Aid, Auto Focus Aid or Bahtinov Aid are open.
 
22

Real-time compensation

22. Real-time compensation
 
Enable this option if you want the temperature compensation to be applied even during image exposures. Disabling it will apply compensations only when there is no image in progress.
 
23

Temperature Source

23. Temperature Source
 
Defines which sensor to use for determining the ambient temperature. Supported are focuser's internal sensor, external sensor or combination of both. The last option will average the readings of the internal and external sensors.
 
24

Steps per Degree

24. Steps per Degree
 
Define how many steps to change per one degree drop in the temperature. Positive value defines outwards move, negative defines inwards move. APT works with high precision corrections and support even compensation with fraction of one position.
 
25

Reading frequency

25. Reading frequency
 
Defines the frequency of checking the ambient temperature.
 
26

Averaging

26. Averaging
 
Defines how many reading to average before calculating the needed temperature compensation. Averaging helps to avoid short temporary changes caused by wind. Frequency 10 combined with Averaging 60 will make temperature compensation on every 600s (10x60 = 600s -> 10 minutes). Note that telescopes can't react fast on the temperature changes, so it not advisable to make corrections in very short intervals.