2" 48mm Brandon

by Vernonscope Print

What would you like to print?
(Reviews and Documents/Videos will not be printed)

Basic Product Information
Full Description
Tech Details
Supplied Accessories
Recommended Accessories

More product information
The 2” 48mm Vernonscope Brandon eyepiece is designed for nigh-perfect low power deep sky observing with any telescope type that can use 2” eyepieces, at focal ratios of f/7 and above. With shorter focal length telescopes, the exit pupil will become larger than your dark-adapted eye’s pupil, wasting some of your scope’s light-gathering capability.

Emission and reflection nebulas, planetary nebulas, globular clusters, open clusters – all look superb against the dark sky background of the tack-sharp, high contrast, 48mm Brandon. Observers typically comment that the 48mm Vernonscope Brandon seems to make their telescopes disappear. They say that looking through the Brandon is like looking at the sky with your bare eye, only with everything larger and sharper, as if the telescope and eyepiece didn't exist.

Eye relief is very long, at 40mm, allowing titaslly unvignetted use with eyeglasses. There is no rubber eyeguard, so keeping your eye centered on the exit pupil to prevent momentary blackouts can be a minor issue until you become familiar with the eyepiece.

Field of view:
The field of view (FOV) is the amount of observable world one can see at any given moment.
Eye Relief:
Eye relief is the distance from the last surface of the eye lens of an eyepiece to the plane behind the eyepiece where all the light rays of the exit pupil come to a focus and the circular image is formed, sometimes called the “Ramsden Disk.” This is where your eye should be positioned to see the full field of view of the eyepiece. If you must wear glasses because of astigmatism, you’ll usually need at least 15mm of eye relief or longer if you want to see the full field of view with your glasses on.

A note on our eye relief figures: Quite often, our eye relief figures will differ from those of the manufacturer. This is because we measure the “usable” eye relief, while the manufacturers specify their usually-longer (but technically correct) “designed” eye relief.

The eye lens of the eyepiece is normally recessed below the rubber eyeguard or rubber rim of the eyepiece to keep the lens from being scratched during use. An eyepiece might have a “designed” eye relief of 15mm (and the eye relief will truly measure 15mm from the eye lens to where the image forms). However, if the eye lens is recessed 3mm below the eye guard, the Ramsden Disk forms only 12mm above the eyepiece body (the 15mm “designed” eye relief, less the 3mm of eye relief made unusable by having the eye lens recessed into the body of the eyepiece). This “usable” eye relief of 12mm (measured from the rolled-down eyeguard – the closest point you can get your eye to the eye lens – to where the image forms) is the eye relief figure we would measure and list in this website.

Why is it important to list the “usable” eye relief? For those people who don’t wear eyeglasses while observing, a few mm difference between the eye relief they expect from the manufacturer’s literature and the shorter eye relief they actually get in real life doesn’t mean a lot. They can simply move a little closer to the eyepiece to see the full field, and never realize that the eye relief is a little shorter than they expected. However, some people must wear eyeglasses while observing, because of severe astigmatism. These observers can’t move closer to the eyepiece if the eye relief is shorter than expected because their glasses get in the way. For these people, the real life “usable” eye relief is more important than the technically correct but sometimes not fully usable “designed” eye relief. We measure and list the actual usable eye relief so that people in the real world can pick the eyepieces that will work best for them.

Focal Length:
This is the length of the effective optical path of a telescopeor eyepiece (the distance from the main mirror or lens where the lightis gathered to the point where the prime focus image is formed). Focallength is typically expressed in millimeters.

The longer the focallength, the higher the magnification and the narrower the field of viewwith any given eyepiece. The shorter the focal length, the lower themagnification and the wider the field of view with the same eyepiece.

Number of optical elements:
Barrel Size:
The industry standard diameter, as of 2011, is 1.25" and is the most common.  Other sizes available are .965" and 2".
The weight of this product.
10.4 oz.
Limited Lifetime
There are currently no Cloudy Nights reviews associated with this product

User Ratings/Reviews from our Customers (www.astronomics.com)
Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(5.00)   # of Ratings: 2   (Only registered customers can rate)

(Only registered customers can rate)

5 - Great (100.00%) (2 users)
4 - Good (0.00%) (0 users)
3 - OK (0.00%) (0 users)
2 - Bad (0.00%) (0 users)
1 - Very Bad (0.00%) (0 users)
0% 50% 100%
astronomics image

Sort Ratings: 

  Show these ratings: ALLGreatGoodOKBadVery Bad

loading request
Showing comments 1-2 of 2
1. Scott on 9/28/2012, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
I purchased this eyepiece for use with my 6" f/12 apo refractor in an attempt to get the widest view possible given the long focal length of this instrument, and for this use it excels. I can easily frame larger objects such as the double-cluster in Perseus, and the view is tremendous! Pinpoint stars across the entire field, and essentially none of the barrel distortion that I find objectionable in many of the newer wide-angle designs. While the extreme eye relief does take a little getting used to, one beneficial side effect is that this is the most comfortable eyepiece I've ever used when wearing glasses. I can easily see the entire field of view and the lens of my glasses is nowhere near touching the eyepiece. Despite its modest apparent field, this eyepiece essentially disappears in use and gives one an experience of the vastness of space that few others do. The contrast is awesome and star images are amazingly sharp. I've also used this eyepiece in my 90mm f/7 apo, and the views were equally impressive, with only slightly worse edge performance. This is one fantastic eyepiece!
Was this comment helpful? Yes No   (3 people found this comment helpful, 0 did not)
2. Mike on 9/15/2012, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
The first time I used this magnificent piece of glass was in my big SCT at a dark site. I sent the scope to M22, the spectacular globular cluster in the southern summer skies, and popped in the 48 and focused and . . . well, there was simply no way to even estimate the total number of pinpoint stars! Brandons have a reputation as the clearest and most precise members of the vast eyepiece herd for a reason. The 48 is simply exquisite for viewing broad expanses of sky in slower scopes, although its performance is said to drop off some at focal ratios faster than about f6. I always use it to dazzle visitors at public outreach events. It is that good.
Was this comment helpful? Yes No   (4 people found this comment helpful, 0 did not)
Showing comments 1-2 of 2
We haven't recommended any accessories for this product quite yet... check back soon or call one of our experts (1-405-364-0858).
This product does not have supplied accessories... or supplied accessories have not been assigned.
No documents have been associated with this product.
No videos have been associated with this product.
Helpful Formulas
Telescope Eyepiece Formula
To calculate the magnification and approximate actual field of view of this eyepiece on your telescope, enter the focal length of your telescope below and press the "Calculate" button.

Enter your telescope's focal length: mm   

Vernonscope - 2" 48mm Brandon

Click icon(s) below & hover image above for zoom

Vernonscope - 2" 48mm Brandon
In Stock
 AstronomicsAstronomicsAstronomicsAstronomicsAstronomics (Average: 5.00 | Users: 2)  Only registered users can submit ratings - Register Here
Our Product #: VB48
Price: $345.00  FREE ground shipping - Click for more info
Congratulations. Your order qualifies for free ground shipping within the 48 contiguous United States.

 E-mail this product to a friend E-mail this product to a friend

Your Email:  
Your Friend's Email:  
Confirm Friend's Email:  

  200 characters or less

An email containing a link to this product has been sent to the email address you provided.

Clear Skies!

 Have a question? Do you have a question about this product?
 Found a better price? Found a lower price? Click to let us know... or call 800-422-7876 before you buy.

If you’ve found a lower delivered price on this product, let us know about it below. We’ll do our best to meet or beat that price and will get back to you within one business day with our best offer. Thanks for giving us the opportunity to give you a better deal.

Your Name:  
From Who:  
Context:  Magazine AdOnline
Website Address:  
Cut and paste the web address into the box above
Your Email:  
Confirm Email:  

We’ll do our best to meet or beat that price and will get back to you within one business day with our best offer. Thanks for giving us the opportunity to give you a better deal.

Clear skies,

This 2” 48mm Vernonscope Brandon eyepiece seems to disappear in your telescope, like looking at the sky with your bare eye, only with everything larger and sharper, as if the telescope and eyepiece didn't exist . . .

. . . our 36th year