Meade MAX-ACF instruction manual Rear cells of Meade Schmidt-Cassegrain models

	Series 4000 Nebular Filters: A modern boon to the city-dwelling deep-space
	observer, the interference nebular filter effectively cancels out the effects of most
	urban light pollution, while leaving the light of deep-space nebular emissions virtual-
	ly unattenuated. Meade Series 4000 Nebular Filters utilize the very latest in coating
	technology, and are available with threaded cells for eyepieces or for attachment to
	the rear cells of Meade Schmidt-Cassegrain models.
	Variable Tele-Extender:For eyepiece-projection photography of the Moon and the
	planets, a Tele-Extender is required. The Variable Tele-Extenderthreads onto the
Fig. 50: Series 4000 8 - 24mm Zoom	telescope's eyepiece-holder, into which is inserted an eyepiece of typically about
	26mm focal length; the 35mm camera body couples to the tele-extender by means of
Eyepiece.
	a T-Mount. The Meade Variable Tele-Extenderpermits a range of projection images.
	#928 45° Erect-Image Diagonal Prism: Diagonal mirrors and prisms result in images
	that are correctly oriented up-and-down but reversed left-for-right. For terrestrial
	observing a fully correctly oriented telescopic image is desirable; the #928 Diagonal
	Prism accomplishes this image correction and places the eyepiece at a convenient
	45° viewing angle. The #928 is for use with the 1.25" Eyepiece-Holder.
	Series 4000 Plössl 9mm Illuminated Reticle Eyepiece: The most advanced com-
	mercially-available illuminated reticle eyepiece, the Series 4000 Plössl 9mm model,
	powered by an internal battery, includes micrometric x-y positioning controls which
	greatly facilitate locking onto the guide star: Turn the finely-threaded controls and
	place the reticle’s crossline pattern precisely at the desired position in the field. The
Fig. 51: #905 Variable Polarizer and	sharp, high-power imaging of the 4-element, multi-coated Plössl optical system is
#1A Skylight Filter.	complemented by a rubber eyecup (foldable for eyeglass wearers) that shuts out dis-
	tracting stray light from the observer’s eye. The upper (lens) section of the eyepiece
	rotates on a fine thread for precise diopter adjustment to the user’s eye. Reticle pat-
	tern is a double crossline with two concentric circles.
	#62 T-Adapter:The T-Adapter is the basic means of prime-focus photography through
	all Meade Schmidt-Cassegrain models. Thread the T-Adapter on to the rear cell of
	your telescope, followed by a T-Mount for your 35mm camera, and the camera body
	is rigidly coupled to the telescope.
	#777 Off-Axis Guider: The Off-Axis Guider provides a means during long-exposure
	astrophotography for the photographer to monitor the tracking of the telescope to
	assure that the telescope remains precisely positioned on the object being pho-
Fig. 52: Illuminated Reticle Eyepiece.	tographed. Like the T-Adapter, the Off-Axis Guider couples the camera body to the
	telescope but it also causes a small amount of the guidestar’s incoming light to be
	diverted at a right angle, where the star’s position can be examined for tracking errors
	with an illuminated reticle eyepiece; position corrections can then be effected using
	Autostar II.

		Piggyback Brackets (not available for 20" model): Piggyback photography is one
		of the most popular and easiest ways to get started in astrophotography. Attach your
		35mm camera, with its own 35mm-to-250mm lens, atop your MAX-ACF in equatorial
		mode, and guiding the camera through the main telescope, wide-field photos of the
		Milky Way of remarkable detail and clarity can be taken.
		Dew Shields (not available for 20" model): In moist climates, water particles sus-
		pended in the atmosphere may condense on the front surface of the telescope's cor-
		recting plate. This dew formation may be inhibited to a significant extent by the addi-
		tion of a dew shield, essentially an extension tube attaching to the front-cell of the tel-
		escope.
Fig. 53: #62 T-Adapter.		#905 Variable Polarizer (1.25"): #1A Skylight Filter: The #905 system includes 2
		Polarizer filters mounted in a specially-machined cell, for glare-reduction in observ-
		ing the Moon. Rotate the thumbscrew at the side of the unit to achieve light trans-
		mission between 5% and 25% of its original value. The #905 inserts into the diago-
		nal mirror of the telescope, followed by an eyepiece. The #1A Skylight Filter threads
		onto the rear cells of all Meade MAX-ACF models and effectively seals the interior of
		the telescope from dust. All other rear cell accessories may then be threaded to the
	Looking at or near the Sun will cause irreversible damage to your eye. Do not point this telescope at or near the		49
	Sun. Do not look through the telescope as it is moving.