21mm Tele Vue Ethos

This year, after the launch of the James Webb Space Telescope, I went to the USA to work on the commissioning of the MIRI instrument of JWST.  Some of my colleagues were also in the States later in the year.  In June, I had the last chance to order something from a webshop in the USA, so I finally decided to order the 21mm Tele Vue Ethos eyepiece.  I ordered the eyepiece on June 7, 2022 and already received it before the end of June.  

The impressive 21mm Tele Vue Ethos eyepiece

I could test the 21mm Ethos the first time during the observing session of the end of July - beginning of August.  The views are really impressive, with a lot of contrast and perfectly correctly all over the very impressive field of view.  In the picture below, you can see the size of the 21mm Ethos compared to the 31mm Nagler eyepiece.  We always called the 31mm Nagler the hand grenade, but the 21mm Ethos is even larger (but a bit less thick).  I guess I also need to find a name for the 21mm Ethos 😛

The 31mm Tele Vue Nagler hand grenate and the equally impressive 21mm Tele Vue Ethos

The 21mm Tele Vue Ethos gives a field of view of 53' when used on my 18'' Obsession in combination with a Tele Vue Paracorr type 2, with a magnification of 113x.  

The addition of the 21mm Tele Vue marks the end of the renewal of my eyepiece collection.  

My full collection of eyepieces

The list below shows my whole collection of eyepieces, with the magnification and FoV, when using the Paracorr in my 18'' Obsession.  If even higher magnifications are needed, I can also use my Tele Vue 2x Barlow to double the magnification of the 13mm Ethos, 8mm Ethos or the 5mm Nagler. 

 

Eyepiece	Magnification	FoV
31mm Nagler	76x	1°04'
21mm Ethos	113x	53'
13mm Ethos	182x	33'
8mm Ethos	296x	20'
5mm Nagler	473x	10'