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- William Optics 1.25" 45-deg Erecting Prism Diagonal
William Optics new 45° EP will work with any 1.25" eyepieces and most scopes with 1.25" eyepiece holders (Please note that diagonals cannot be used with Newtonian or Dobsonian reflector telescopes). It will turn upside down images right side-up and give correct left-to-right image. This high-quality, low-cost erecting prism will set the standard in erecting prisms!
• Large, high-quality BAK4 erecting prism with anti-reflection coating allows for good contrasted and bright images.
• Brass compression ring.
• 1.25" eyepiece holder comes with anti-marring brass compression ring.
• Extremely competitive price/quality ratio.
• Entirely aluminum, black anodized eyepiece holder.
• Large, chromed thumbscrews.
• Internally matte blackened and threaded for no internal stray light reflection.
Prism: High quality BAK4 with anti-reflection coating
Materials: Entirely machined aluminum
Angle: 45 degree
Prism clear aperture: 25mm; 1.25" with brass compression rings
Weight: 6 oz
Easy to Use,Compact,Quality Lenses,Lightweight,Accurate,Strong Construction
Exceptional value for money. Far superior over the one that's supplied with my celestron nexstar. Excellent light transmission and a clear image. High quality, well made piece that delivers. It is great having a 90 deg and 45 deg piece in your kit bag. Highly recommended product. Thank you to Agena for your stellar service and top items.
Melbourne, Victoria Australia
Lightweight,Quality Lenses,Easy to Use,Strong Construction
Works great with my C6 for use as a spotting scope, bird watching and terrestrial viewing. Built solidly and excellent fit and finish.
Very nice item, IMO.
As always, service was great at Agena Astro.
Quality Lenses,Strong Construction,Lightweight
A definite improvement in brightness, contrast and clarity over "supplied" diagonals. Don't expect to see staggering differences, but definite, subtle improvements to be sure. This is a quality product that you can purchase with confidence that you will be satisfied. I know I am not supposed to mention the OUTSTANDING customer service that is automatic with any AGENA purchase.....so I won't go into that!!
Accurate,Strong Construction,Quality Lenses
Well made. No-mar eyepiece securement
Quality Lenses,Strong Construction
A very good quality diagonal. Does not feel cheap, like others out there. You do get what you pay for. I use this for mainly daytime use but will use it when observing the moon on occasion. If in need of an erecting diagonal, do not be leery to spend the extra over a lesser quality one.
Lunar Observation,Daytime Use
Quality Lenses,Easy to Use,Strong Construction
Beautiful construction, good optical quality. The images are contrasted.
Superior image quality,Good quality large prism,Good looking exterior
I wanted a 45 degree erecting diagonal to use with my 6" f5 achro. I have a nice 90 degree diagonal for stargazing, and the erecting diagonal was to be for casual terrestrial use. First I tried a model from one of the major mass astro sellers. It did what it was meant to do, but the construction was mostly plastic, and I wasn't particularly impressed by the quality of the images, which were somewhat dim and muddy looking, so I decided to try the 45 degree erector from a major maker of high end scopes and eyepieces and was surprised to find it to be very similar in construction to the first one. The clear aperture of both prisms was small, and I could see the edges of the prism in the second one by looking thru each end of the diagonal. No surprise that image quality in it was not even as good as in the first. It appeared that the concept of a good quality 45 degree erecting prism diagonal was not taken seriously by the big players in the astro equipment field.Or so It seemed until I came across the William Optics 1.25 Inch 45 Erecting Prism Diagonal on the Agena Astro Products website. Externally it is very different in appearance from the typical erecting diagonal. Whereas the common erecting diagonal prism is angular and the prism housing is shaped like a pyramid, the WO diagonal is more esthetically pleasing in that it is consists mainly of curved shapes. The prism housing is round, and the eyepiece adapter tube exterior sides are concave. The unit is a handsome black and chrome. It's made entirely of aluminum. Best of all, though, is the prism. It's large, with 25mm clear aperture, made of BAK4 glass and with anti-relection coating. As soon as I had inserted the WO diagonal with a generic 37X Plossl ep in my scope I could see that this erecting diagonal gave images that were far and away better than the other diagonals. Bright, sharp, and contrasty up to about 80X, I had found the erecting diagonal I was beginning to think didn't exist. This was my first experience with William Optics products. Seeing the handsome white box with the red swan logo, and the manner in which the diagonal was packed in a solid block of foam did not fail to make an initial favorable impression. This is what one expects with high-end expensive astro accessories (but often doesn't get). And here's the kicker-I paid only [$]for this item. It's a steal at that price.Agena Astro Products aims for customer satisfaction. Obviously I am very pleased with the WO diagonal[...]
Bird Watching,Travel,Just fun land viewing
Oak Ridge, TN
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