ATIK Cameras Apx60 Руководство - Страница 6

Просмотреть онлайн или скачать pdf Руководство для Цифровая камера ATIK Cameras Apx60. ATIK Cameras Apx60 12 страниц.

Dark frames

To get the most out of your Atik Apx60 camera for astrophotography, we

recommend processing your images using dark frames. You can take dark

frames by covering the front of the camera with a lens cap. Dark frame should

be taken at the same temperature, exposure length and with the same gain and

offset settings as your light frames.

A master dark should be generated by averaging a large number of individual

dark frames. This can then be subtracted from the individual image sub frames

during processing. Further information on using dark frames should be available

in the manual of whichever image processing software you choose to use. Dark

frames are not required for High-Speed Imaging.

Binning is a technique where groups of pixels are added together, with the

result being a brighter image. The CMOS sensor in the Atik Apx60 only supports

binning in software. This is where the pixel values are added together after

image acquisition, as opposed to hardware binning where pixels are combined

on the sensor.

Your Atik Apx60 allows you to change the gain and offset settings for the

camera. In very simple terms, this is analogous to the volume control on a

radio. The greater the gain, the easier it is to detect faint signals; however, less

detail might be seen in the brighter ones.

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. The

gain can be set from 0 to 36 and the offset set from 0 to 4095. 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.