27mm 2" Panoptic

by TeleVue Print

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An excellent premium-quality low power wide field 2” eyepiece for the serious deep space explorer. The calculator below will show you just how wide the field will be with your particular telescope. For example, it will give you a 0.92 degree field at 74x with a big 17.5” f/4.5 Dobsonian. That’s almost two lunar diameters and is ideal for observing large emission and reflection nebulas and nebula remnants.

While it’s particularly well-suited for use with Dobsonians (it provides a huge 6mm exit pupil for rich field observing on an f/4.5 scope), it can provide “picture window onto space” images with any telescope type that can use a 2” eyepiece. With 16mm of usable eye relief, the 27mm Panoptic can be used by eyeglass wearers with almost no vignetting of the field of view. The 27mm Panoptic would be a welcome addition to any serious eyepiece collection.

It weighs a substantial 18 ounces, so you may have to do a little scope rebalancing when you use it with some low friction Dobsonians.

Field of view:
The field of view (FOV) is the amount of observable world one can see at any given moment.
68°
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.

16mm
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.

27mm
Number of optical elements:
6
Barrel Size:
The industry standard diameter, as of 2011, is 1.25" and is the most common.  Other sizes available are .965" and 2".
2"
Weight:
The weight of this product.
18 oz
Warranty:
Limited Lifetime
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Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(4.50)   # of Ratings: 2   (Only registered customers can rate)

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1. Jay on 5/23/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
The eye relief is noticeably less than Radian or even T4. I have no problem, but I don't wear glasses. Kids at outreach need more help with eye placement before the "wow" for daytime solar than for night time views.

The outstanding aspect of this eyepiece is the sharp view across the full field in an f/6 refractor, a stunning way to scan the Milky Way, and something I didn't see when trying a couple of modern competing 68 degree eyepieces and an older 'classic' wide angle eyepece in the 24mm - 32mm range.

It's great with a Paracorr in reflector, too, and not too hard to balance, plus this may give an exit pupil that keeps sky a little darker than longer and heavier eyepieces.

At about 75x and 0.9 degrees in an 8-inch SCT, this makes a good deep sky or crescent moon eyepiece too.
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2. Robert on 3/14/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
Very sharp and contrasty right out to the edge. It barlows very well. Its pincushion distortion has never bothered me. The main downside to this eyepiece is the lack of eye relief. It has about 16mm of usable eye relief due to the deeply concave eye lens. If you try to push into it to see the field stop, you will inevitably scratch your eyeglasses on the edge of the top retaining ring. That is the main reason I don't use it as much as I had hoped I would.
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65mm x 80mm eyepiece container
by Astronomics
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$3.99 
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LensPen Optics cleaning tool
by Celestron
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$9.95 
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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   



TeleVue - 27mm 2" Panoptic

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TeleVue - 27mm 2" Panoptic
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 AstronomicsAstronomicsAstronomicsAstronomicsAstronomics (Average: 4.50 | Users: 2)  Only registered users can submit ratings - Register Here
Our Product #: PAN27
Manufacturer Product #: EPO-27.0
Price: $370.00
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An excellent premium-quality low power wide field 2” eyepiece for the serious deep space explorer . . .





. . . our 34th year