21mm Tele Vue Ethos

By -

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'

Location: Roosbeek, 3370 Boutersem, België

Comments

Post a Comment

Popular posts from this blog

Installing an ASA AZ800 in the observatory at work

By -
Image
On August 30, 2023 we installed an ASA AZ800 telescope in the observatory at work, at the  Institute of Astronomy  of KU Leuven .  The telescope will be one of the telescopes of the MARVEL project, an array of four telescope we will install on the Roque de los Muchachos in La Palma,  It was a very rainy day, but we managed to put the telescope in the observatory.  Enjoy some of the pictures! The upper part of the telescope in the corridor. The lower part of the telescope ready for lifting up. The lower part of the telescope going up. The lower part of the telescope entering the dome. The upper part of the telescope entering the dome. The installed telescope.
Read more

Interstellarum Deep Sky Atlas

By -
Image
For Father's day, I got the field edition of the  Interstellarum Deep Sky Atlas .  In the past, I always used the first edition of Uranometria 2000.0 by Will Tirion, which was published in 1987!  I was always very happy with the Uranometria and I always preferred the first edition over the second edition.  I never took the book outside, but I made a copy of every page which I put in a sheet protector.  I took the pages in a big folder outside to starhop through the skies.    The Interstellarum Deep Sky Atlas comes in a nice sturdy slipcase. The last years, I mostly observed from home (Bortle 5), so I mostly observe bright objects.  Since last year, I added a SkyFI 3  to my Argo Navis / ServoCat so I can use SkySafari to always have a map on my phone or my tablet.  However, a real star atlas has a nicer overview, which is very useful when observing.  Under dark skies, a good star atlas is really needed to find the faintest objects. A nice card with the legend of the atlas The nice t
Read more

One observing night at the Roque de los Muchachos at La Palma

By -
Image
I was on La Palma from January 15 to January 21 for a technical mission at the Mercator telescope.  The weather was not very good, but I managed to get out the Orion Skyquest XT12i IntelliScope  we have in the Mercator building on the first evening I was there.   I forgot already that the sky is so unbelievably good from the Roque de los Muchachos.  There was quite some wind, but I could hide behind the car, so the wind did not disturb me that much.  The telescope has a right angle finder and a telrad, but the batteries of the telrad were empty, so I could not use the telrad.  Pointing the telescope with only a right angle finder is very difficult, so it was not easy to find the objects I was looking for.  It was quite cold, with a temperature of 2.3° when I started observing around 19h40 and a temperature of 3.7° when I stopped around 22h15.  The humidity fell from 57.5% to 33.2% and the wind speed was around 6 m/s.  I did not observe for a very long time, because I had to wake up ve
Read more