ATIK Cameras ACIS Series Manuel - Page 7

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Gain Pre-sets

We provide three gain pre-sets, and the option to use your own custom settings.

The pre-sets are:

Low - Best for normal imaging. It is the best setting for detail in brighter objects

and when individual images have high dynamic range.

Medium - A compromise of low and high. It's very useful if your mount is

unguided and you need to take a lot of shorter exposures.

High - Best for sensitivity on dim objects, but sacrifices detail in some of the

brighter parts.

Custom - You can also experiment with using your own gain and offsets.

As mentioned, we find gain settings up to x30 are useful, depending on the

situation, but above this the full well depth becomes incredibly low.

Offset for Advanced Settings

The offset is a voltage added to all pixels. It's used to ensure the digitised pixel

values remain above zero while maximising dynamic range. It can set between

0 and 511, with the default setting as the Low pre-set values.

Additional Settings.

Pad Data – The Atik ACIS sensor creates a 12-bit image, however, as images

are usually stored as 16-bit images, this means we have a choice as to which

bits the image uses. The 'Pad Data' setting allow you to choose between

these options. With the checkbox ticked, the image will be stored in the upper

12-bits, with all pixel values being multiples of 16 (from 0 to 65535). With the

checkbox unchecked, the image is stored in the lower 12-bits, meaning that all

pixels will fall into the range 0 to 4095.

We would generally recommend keeping the 'Pad Data' checkbox ticked.

However, if you are binning, you can increase the dynamic range of the image by

keeping the checkbox unticked. For example, in 2x2 binning, each pixel is the sum

of four individual pixels, each with a value between 0 and 4095. As a consequence,

the binned image will have pixels in the range of 0 to 4 x 4095 (= 16,380).