Polaroid ST-7E, ST-8E, ST-9E manual Connecting the older model CFW-6 filter wheel to the Camera

		Section 4 - Camera Hardware
	C8, 8" f/10		LX200, 10" f/35		14" f/11
	Field of	Pixel	Field of	Pixel	Field of	Pixel
	View	Size	View	Size	View	Size
Camera	(arcmins)	(arcsecs)	(arcmins)	(arcsecs)	(arcmins)	(arcsecs)
Tracking	4.2x4.2	1.3x1.5	11.7x11.7	3.7x4.3	2.3x2.3	0.7x0.8
CCD
ST-5C	5.4x4.1	1.0x1.0	14.4x10.8	2.7x2.7	2.8x2.1	0.5x0.5
ST-237	8.0x6.0	0.75x0.75	21.6x16.2	2.0x2.0	4.0x3.0	0.38x0.38
STV	8.0x5.0	1.5x1.5	21.6x13.5	4.0x4.0	4.0x2.5	0.75x0.75
ST-6	14.6x11.1	2.3x2.7	38.9x29.5	6.2x7.3	7.6x5.7	1.2x1.4
ST-7E	11.9x7.9	0.9x0.9	31.2x20.8	2.4x2.4	6.1x4.1	0.5x0.5
ST-8E	23.8x15.8	0.9x0.9	62.4x41.6	2.4x2.4	12.2x8.2	0.5x0.5
ST-9E	17.6x17.6	2.0x2.0	46.2x46.2	5.3x5.3	9.1x9.1	1.1x1.1

	Table 4.4 - Field of View
		Focal Length to fill	Focal Length to fill
Object	Size	Tracking CCD	ST-7E
Moon	0.5°	275mm =	760mm =
		11 inches	30 inches
Jupiter	40 arcseconds	13000mm =	34000mm =
		510 inches	1350 inches
M51-Whirlpool	8 x 5	1040mm =	3700mm =
Galaxy	arcminutes	41 inches	145 inches
M27-Dumbell	8.5 x 5.5	"	"
Nebula	arcminutes
M57-Ring Nebula	1.3 x 1	6400mm =	23000mm =
	arcminutes	250 inches	900 inches

Table 4.5 - Focal Length Required

From these numbers you can deduce that the popular C8, an 8" f/10 telescope will nicely frame many popular objects with the ST-7E whereas a much shorter system (f/3, perhaps achieved with a focal reducer) will frame the same objects for the tracking CCD. Another point to bear in mind is that, except for planetary images, you'll rarely take images where the pixel size in seconds of arc is down near the seeing limit. Most objects are relatively large, where the field of view is more important than whether the individual pixels are less than half the seeing.

4.6 Connecting the older model CFW-6 filter wheel to the Camera

The SBIG CFW-6 filter wheel can be connected to the camera using the relay port adapter provided with the camera. The adapter plugs into the 9 Pin connector on the ST-7E/8E/9E head. The phone cable connection connects to the telescope drive to adjust the telescope position when collecting images using Self-Guiding, and the short cable with three

5f/6.3 with the Meade star digonal focal reducer.

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