0.85x Focal Reducer/Corrector for Sky-Watcher PRO 80 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher PRO 80 ED APO, this superb quality accessory effectively reduces the telescope’s focal length by a factor of 0.85x and provides much improved field-edge correction. Features:

• 55mm back focus
• M48 threads (not standard T-thread)
• Drops ProED 80 from f/7.5 to f/6.3

The 2" CCD compressor reduces the focal length of telescopes with the factor 0.67x, thus allowing significantly shorter exposure times.

• ♦ The focal reducer is perfectly suitable for RC telescope. It also works good with Celestron EHD or Meade ACF telescopes or with refractors up to the focal ratio F/9
• ♦ The image field of DSLR cameras up to APS-C format is illuminated - full illumination up to 29 mm
• ♦ Easy connection to the telescope via 2" barrel
• ♦ Optimal working distance from the M48x0.75 thread to the camera sensor is 85 mm - enough space for accessories like off-axis guider or filter wheel
• ♦ 2" filter thread at the telescope side

• Coma Corrector for Newton telescopes, that neither does reduce the focal length nor the image field of your telescope
• 46 mm clear lens diameter in M48 mode – enables exposures free from vignetting
• designed for fast f-ratios up to f / 3.5. Maximum sharpness across the entire image field
• Phantom Coating™ Group, multicoated for maximum transmission and total freedom from reflections
  
  
• Visual & Photographic Version consisting of:
  • 2" Multi-Purpose Coma Correktor (MPCC) Mark III photographic #2458400A
  • Baader Focusing Eyepiece Holder 1¼" / T-2 (T-2 part #08A) (#2458125)
  • Baader VariLock 29, lockable T-2 ExtensionTube 20-29mm with spanner tool (T-2 part #25Y) (#2956929)
  • Baader Hyperion 2" Finetuning Stopring with brass clamping ring & 2 thumb screws (#2958027)

The TS Superflat GPU coma corrector is one of the best correctors for astrophotography through fast Newtonians.

• 4-element coma corrector for excellent imaging in the field and on the axis.
• Designed by Gyulai Pal in Hungary (GPU-Optics)
• Perfectly suitable for Newtonian telescopes with focal ratios of f/4 - provides very good results from f/3.5 to f/6.
• Very tolerant against tilting.
• Focal length is not changed.
• Camera connection through M48 thread.
• For better stability and accuracs, the corrector can be screwed to the focuser. Connection adapters for cameras and focusers are available.