Orion Explorer II Zoom 7mm-21mm


 Info  Votes  Messages  More Stats  Up One Level
Brand and Model:Orion Explorer II Zoom 7mm-21mm
Price ($USD):$54.95
Type:Zoom
Focal Length:7-21 mm
Barrel Size:1.25 in
Apparent FOV:30.0 degrees
Field Stop Dia.:0.0 mm
Eye Relief:0 mm
Elements:4
Weight (lbs):
Description:Orion Explorer II Zoom Eyepiece



This Eyepiece if from Orion in the USA. It is manufactured in Taiwan.

It is ideal for Department Store scope owners who want a better eyepiece than the cheap trashy oculars supplied with most of these scopes. This eyepiece has a twisting body housing that alters the focal length between 21 and 7mm or anything in between.

This EP is ideal for ‘capturing’ an object at low power, and then smoothly zooming in with a one-third-turn of the body. Operation soon becomes second-nature. Surprisingly, the focus doesn’t change much and only needs small ‘tweaks’ when altering the magnification. It is very easy to use.

I believe it uses a 4 element design and the lenses are coated (looks like MgF2 to me). The quoted eye-relief varies from 33mm to 16mm over the range of focal lengths and the AFOV varies between 30° at 21mm to 43° at 7mm. The long eye-relief was a pleasant surprise. A fold-down rubber eye-shield is supplied. The barrel is threaded to take standard filters.



This EP surprised me. It is inexpensive, £53 in the UK including tax &

delivery, especially so considering it is a zoom type. The EP is finished in a satin black aluminium body with a clear anodised pointer ring near the base. The tooled rubber grip on the body makes adjustment of the focal length easy, even when wearing gloves. This EP provides good image quality for the money, especially in the mid-range focal length values (10-12mm) and I much prefer it to my ‘generic’ 10mm Plossl because of its bigger eye lens, sharper, brighter image quality and much longer eye relief. It is a delight to use, a very versatile eyepiece.




Vote Highlights Vote
Orion Explorer II Zoom 7mm-21mm
For a very inexpensive zoom eyepiece, I found the performance of the Orion 7-21mm Zoom quite surprising. Sure the field of view is very narrow, even compared to other zooms available. However, at higher magnifications in the 12-7mm range, it performed quite admirably on Jupiter and Saturn - nearly equal in brightness, contrast and sharpness to my 9mm and 6mm Vixen LVs. Eye relief was generous and the FOV was adequate in this focal range at around 45 degrees.

It is a definate "best buy" if you really want a zoom for higher magnifications but don't have the money to spend on the pricier Televue or Vixen 8-24mm.

Overall Rating: 8
Optics:7 Value:8
Weight: 10 (Trustworthy Vote)
Date:
By: PJBilotta
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=429699


Orion Explorer II Zoom 7mm-21mm
Used on an ETX90. Excellent contrast and sharpness between 21mm and 10mm, softens below 9mm. (Comparing to Orion Explorer 10mm, Orion Sirius Plossl 6.3mm, Meade Super Plossl 26mm).
Shadow transit (Ganymede) very clear last night at about 15mm, infact my best view ever!
Excellent construction quality for the price. Only slight focus drift on zooming. Zoom action is a little stiff for my liking - enough to cause image shift especially at high power.
Easier to use than my 6.3mm eyepiece because it is physically longer.
I noticed that you have to get your eye lined-up carefully for the best view.
Overall an excellent buy, but best considered as a 9-21mm zoom.

Overall Rating: 9
Optics:7 Value:10
Weight: 5 (Veritable Vote)
Date:
By: Anonymous (xxx.xxx.50.178)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=56900


Orion Explorer II Zoom 7mm-21mm
I purchased this eyepiece about 6 months ago on Astromart and only starting using it recently. I do a lot of lunar, planetary, and daytime viewing with an Orion 5" Mak and usually use Televue plossls or UO orthos because of their clarity and light throughput. To my surprise, the Orion Explorer II provides much of the same clarity and brightness, especially in the mid range (10 - 18mm), as these other eyepices and is a snap to use. It seems well coated, has generous eye relief, includes a useful eyecup, and does not ghost on bright objects. The FOV gets narrow at 21mm, but nothings perfect. For the price of a mid-level quality plossl, it does alot of things right and is fun to use. Highly recommended.

Overall Rating: 9
Optics:8 Value:10
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.213.41)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=366044


Orion Explorer II Zoom 7mm-21mm
I bought one to use in a C-90 daytime spotter scope, but immediately returned it because the FOV was so narrow -- like looking through a tunnel. No way can it compare to my Vixen 8-24mm zoom. Granted, there is a sizable difference in cost between the two, but even looking at it on price vs value, I would not recommend it.

Overall Rating: 3
Optics:7 Value:3
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.89.175)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=235580


Orion Explorer II Zoom 7mm-21mm
either i have got a lemon or the rest of you are easily pleased! a typical zoom
eyepiece looks good on the outside and the idea sounds good but totally lacks to perform on my starmax 127, contrast non existent, reminds me of a cheap 60mm refractor i owned as a kid ,very
washed out views. stick to a good plossl
otherwise i think you will regret!

Overall Rating: 2
Optics:2 Value:2
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.64.8)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=97114


Orion Explorer II Zoom 7mm-21mm
Agree with above comments. Very sharp and bright above 9mm, somewhat dimmer below.As good as Orion sirius Plossl 10mm eyepiece on Orion 127mm Apex with greater eye relief. I bought this on the strength of the above reviews and am very happy with it, thanks guys. For 53 this is an absolute bargain if ever there was one!

Overall Rating: 9
Optics:8 Value:10
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.48.177)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=58681


Orion Explorer II Zoom 7mm-21mm
very good eyepiece, yes there is some ghosting and below 9mm F/L the images were not as crisp. Using with Helios 80mm short tube and televue barlow. Not as good as individual ep set but for the money. Have also used it in 8 inch Maksutov Newtonian with good result

Overall Rating: 9
Optics:8 Value:10
Weight: 1 (Unreliable Vote)
Date:
By: Anonymous (xxx.xxx.237.35)
Link to this vote: http://excelsis.com/1.0/displayvote.php?voteid=53709

Click here to see all votes (7 total)
[Click Here to Login]
Don't have a login? Register!