Titan Type II ED 35mm 2" 68° wide field eyepiece

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The Astro-Tech Titan Type II ED 2” 35mm eyepiece has a wide 68° field of view, with tack-sharp images from one edge of the high contrast field to the other. It provides superb wide field views with any telescope type, and works particularly well for low power viewing with the f/6 to f/7 focal ratio small aperture refractors on altazimuth mounts that are so popular for grab-and-go observing.

Its 35mm focal length gives you a wide 5mm to 6mm exit pupil with this type of refractor, for very bright images of open clusters and large and faint deep space nebulas and nebula remnants. With the 560mm focal length of the 80mm f/7 Astro-Tech AT80ED refractor, for example, it provides a stunning 4.25° field of view at 16x, with a bright 5mm exit pupil, ideal for scanning the star clouds of Sagittarius.

The 35mm Titan Type II ED’s six-lens wide field ED optical design has the high contrast and bright images that make faint nebular wisps pop out against a very dark sky background, as well as showing you myriad subtle levels of contrast in bright nebulas. Pinpoint stars across the entire field make open clusters look like a handful of diamonds scattered across a black velvet cloth.

This stunning wide field views you will see in this 4-3/8” long 12 ounce 35mm Astro-Tech Titan Type II ED eyepiece will take your deep space grab-and-go observing to an entirely new level, at a price/performance ratio no other top-quality eyepiece can touch.

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.

14mm
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.

35mm
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.
12 oz.
Warranty:
2 years
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1. Conrad on 5/2/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
This is my favorite eyepiece. When I hook this up to a 16" Meade SCT, I get some unbelievable deep sky views( i.e., 1/2 degree field of view). Image quality is good and being light-weight doesn't throw my telescope off balance.
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General Accessories
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65mm x 120mm eyepiece container
by Astronomics
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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   



Astro-Tech - Titan Type II ED 35mm 2" 68° wide field eyepiece

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Astro-Tech - Titan Type II ED 35mm 2" 68° wide field eyepieceImage showing a typical Titan Type II ED eyepiece with the twist-up eyecup both retracted for eyeglass use and extended for use without glasses.
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This low power wide field 2” Astro-Tech Titan Type II ED eyepiece is great with compact grab-and-go refractors for viewing large-scale deep space objects – open clusters, nebulas, star clouds, and more . . .





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