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TELE VUE ETHOS 21MM

$830.00
Article number: ETH210
Availability: In stock
Delivery time: In Stock Now
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  • FREE STANDARD SHIPPING ON ALL ORDERS
  • 90 DAY RETURN POLICY
  • DON'T SEE WHAT YOU NEED? CALL US!

Tele Vue's Ethos 21mm focal length completes the logical set of 21mm/13mm/8mm and nicely juxtaposes the 17mm/10mm/6mm combination. Each step within these two sets approaches a 3x field area gain. The 21mm's effective field stop diameter is 36.2mm, bringing its true field close to the 35mm Panoptic (38.7mm Field Stop diameter). Its true field is also larger than the 26mm Nagler with its 35mm effective field stop diameter. In an f/4 Dobsonian, the exit pupil is just 5.25mm using the 21mm Ethos instead of 8.75mm with a 35mm Panoptic, or 6.5mm with a 26mm Nagler.

 

Model # ETH-21.0
Focal Length (mm) 21
Barrel Size (in.) 2"
Apparent Field of View (deg.) 100
Eye Relief (mm) 15
Weight (lb / oz) 2.25 / 36.0
Field Stop (mm) 36.2

No specifications found

  • Code ETH210
  • Weight 1360
  • Size X 63
  • Size Y 12
  • Size Z 12
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