(1 review)

in stock
in stock

TeleVue Ethos 21mm - Eyepiece - 2" - 100° field

831,93 EUR
excl. VAT
excl. 4,65 € Shipping costs


Tele VUE Ethos 21mm

TeleVue Ethos 21mm - ETH-21.0

The 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.

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

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Customer reviews:

Author: Philippe FABRE, 25.11.2017
Evaluation: TEXT_OF_5_STARS

"*** [En] An open window on the Universe. An undeniable comfort of use. A huge field. Whether for short or long focal length, the pleasure of rediscovering objects has amazed us. Tested on a T400 f / d 10 and T350 f / d 5 (without correction), the nights were magical. The color felt is neutral, on the T400 we did not see any coma. Be careful with the weight, it is 1.02 kg! No regrets of purchase, a real race beast."


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