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Meade - 12" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)

Model#:1208-80-00

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Manufactured by: Meade

Details

Meade 12" ACF Advanced Coma Free Optical Tube Assembly

The Meade Instruments 12" f/8 ACF Optical Tube Assembly (OTA) features a 12” aperture, f/8 optical system with Meade’s Advanced Coma Free (ACF) optics and high-contrast baffling that ensures crisp, pinpoint imaging to the very edge of the field. The OTA features an internal zero image shift 3” Crayford-style 10:1 focusing system with a 2-speed, 7:1 reduction control that rigidly holds the OTA’s primary mirror, eliminating the need for a mirror lock, and provides smooth, precise focusing. The OTA has a focal length of 2,438mm.

The OTA includes a Meade Series 5000 HD60 25mm eyepiece and a 2” Series 5000 enhanced 99% reflectivity diagonal. It also comes with an 8 x 50mm refractor viewfinder with quick-release mounting bracket. An optional 2” diameter, 3-element f/5 focal reducer/field flattener (sold separately) lets you gain even wider, flatter fields with faster exposures, even on larger sensors.

The OTA comes with a precision-machined Losmandy-style dovetail rail mated to the tube with wide-stance radius blocks for steady mounting and front and rear dust covers.

 

  • OTA with 12" clear aperture, f/8 optical system, and Meade's ACF optics
  • High-contrast baffling ensures crisp, pinpoint imaging to the very edge of the field
  • Internal zero image shift Crayford-style focusing system with a 2-speed, 7:1 reduction control
  • 2,438mm focal length
  • Low-expansion borosilicate glass primary mirror
  • Secondary Mirror: Low-expansion borosilicate glass that is individually figured with the primary mirror for minimum correction
  • Correcting Plate/Lens: Aspheric high-spectral transmission Borofloat glass from Schott AG Germany
  • Meade Series 5000 HD60 25mm eyepiece
  • Series 5000 2" diagonal with enhanced 99% reflectivity
  • 1.25" adapter that holds the eyepiece upright for easy viewing, and provides for comfortable right-angle viewing
  • Viewfinder: 8 x 50mm refractor
  • Precision-machined Losmandy-style dovetail rail mated to the tube with wide-stance radius blocks

 

 

 

 

 

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Additional Information

Name Meade - 12" ACF Advanced Coma-Free (f/8) Optical Tube Assembly - (UHTC)
Manufacturer Meade
Model 1208-80-00
Aperture 12"
Backfocus Distance Optimal: 3.5" (88.9 mm) at f/5
Dimensions 23.00 x 13.75" (58.40 x 35.00 cm) - LxDiameter
Eyepieces HD-60 25 mm long eye relief eyepiece
Focal Length 2,438 mm
Focal Ratio f/8
Focus System Internal Crayford-style, zero image-shift primary mirror focus with dual speed 7:1 control
Material Optical Tube: Aluminum
Mount OTA: Losmandy-style mounting plate
Optical Coatings UHTC
Optical Design Advanced Coma-Free
Resolving Power Dawes Limit: 0.38 arcseconds
Secondary Obstruction (%) Secondary: 16.86%
Star Diagonal Series 5000 2" with enhanced 99% reflectivity
Viewfinder 8 x 50 mm refractor with cross hairs