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Enable Histogram preview
If enabled the histogram will be displayed as distribution curve into the preview window together with the current min/max value. If you move the mouse in the preview window the current value of the mouse position will be shown as well. In the second line a special noise value will be shown introduced by Emil Kraaikamp. It shows the current pixel-to-pixel noise level of a frame, as an indication if it's useful to switch to 12-bit recordings instead of 8-bit. If this value is below 2 it turns red and indicates it might be better off switching to 16-bit mode. You can find a very interesting discussion about Emil's research here. The histogram can be displayed as full histogram or as bar at the bottom of the preview window depending Histogram Settings.

Hint: You can toggle the histogram preview quickly by pressing "h"on the keyboard

Ephems
Enable ephemerides and focal-length calucation
keyboard shortcut: 'e'
If enabled FireCapture will try to calculate the ephemerides for the current object. If you have defined a Planet in your current profile (see "Profiles" in Capture) the ephemrides (diameter, magnitude and central meridianes) will be shown in the live view. If the pixel size of your camera could be figured out the effective focal-length and resolution will be shown in the second line too. These details will also be written to the capture logfile regardless if "Ephems" is enabled or not.

Align-Box
Enable alignment box preview
If enabled the current alignment box of the blob detection will be shown as red rectangle in the preview window. Will be checked automatically when you open the Alignment Settings.

Auto-Align
Enable automatic image alignment
If this option is enabled FireCapture will try aligning the incomming frames automatically using the current blob detection settings. Before using this feature it is absolutely necessary to understand how to setup the blob detection and alignment box correctly in order to achieve the best results. Please check the related Alignment Settings settings for this. When Auto-Align is turned on the uncorrected position of the object will be marked with 4 red dots. This is useful for correcting any image drift in time before the object moves out of the field of view.  

Autoguide
Enable autoguiding
If you have setup a telescope interface in the AutoGuide Settings this option is enabled and if checked FireCapture will track your object and send corrections to your telescope mount. Also 4 green arrow-buttons are shown in the right upper corner of the preview window. You can press these buttons to control your telescope mount by hand just as you would do using the handcontroller.  

CutOut
Cutout a sub-rectangle
This option is very useful for reducing the file size of your capture data. You can set the desired cutout rectangle by click&drag the mouse in the preview and FireCapture will capture this sub-region instead of the current image size. The cutout rectangle will be displayed as white rectangle. Together with auto-aligning enabled this is a very powerful option for capturing planets. If you select the "Let the CutOut box track the planet" option in the General Settings the CutOut box will follow the planet's motion and you don't need to enable AutoAlign during capture.

Focus-Help
Enable focus help in the preview window
keyboard shortcut: 'f'
When selected this option FireCapture tries to compute the edge sharpness of the planet as a focus indication. It plots this relative value as red line in the preview window. The higher the dots the better the focus should be. This may not work well enough on poor or average seeing conditions.

Darkframe
Enable darkframe substraction
With this option you can set a darkframe and FireCapture will substract this from every frame. This will be indicated by showing "Darframe" in the preview window.

Reticle
Displays a red crosshair in the preview
keyboard shortcut: 'c'
Useful for collimation

Flip X
Flip the image horizontal

Flip Y
Flip the image vertical

Debayer
Visible only for color cameras supporting Y800 format. See Debayer Settings for details.

DeRotate
Experimental Derotation. See DeRotate Settings for details.