SXVF-M25C handbook - Starlight Xpress
SXVF-M25C handbook - Starlight Xpress
SXVF-M25C handbook - Starlight Xpress
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Handbook for the SXV-<strong>M25C</strong> Issue 1 June 2004<br />
You can now select an exposure time of 0.1 seconds, followed by pressing of the<br />
‘Take Photo’ button.<br />
After the exposure and download have completed (about 16 seconds) an image of<br />
some kind will appear on the computer monitor. It will probably be poorly focused<br />
and incorrectly exposed, but any sort of image is better than none! In the case of the<br />
pinhole, all that you can experiment with is the exposure time, but a camera lens can<br />
be adjusted for good focus and so you might want to try this to judge the image<br />
quality that it is possible to achieve. With our 2 inch adaptor, most lenses come to<br />
infinity focus at about midway through their normal focus adjustment range. The<br />
large size of full resolution M25 images makes them difficult to visualise on most<br />
computer screens and only about one third of the image may be visible. You can<br />
‘scroll’ around the image using the sliders at the right and bottom edges, or select ‘Bin<br />
high res. display’, as found in the ‘View’ menu. This reduces the displayed image to<br />
half size and most of it will now be visible – the image data is NOT affected.<br />
Various other exposure options are available, as can be seen in the picture of the<br />
interface above. For example, you can ‘Bin’ the download 2x2, or more, to achieve<br />
greater sensitivity and faster download, or enable ‘Continuous mode’ to see a steady<br />
stream of images. The 4x4 or 6x4 binning modes give adequate resolution for finding<br />
and offer a much faster download speed, along with a very high sensitivity.<br />
‘Focus mode’ downloads a 128 x 128 segment of the image at high speed. The initial<br />
position of the segment is central to the frame, but can be moved by selecting ‘Focus<br />
frame centre’ in the ‘File’ menu and clicking the desired point with the mouse. The<br />
focus window has an adjustable ‘contrast stretch’, controlled by the 12-16 bit slider.<br />
The image will be normal if 16 bits is selected, while setting lower values will<br />
increase the image brightness in inverse proportion.<br />
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