This new version has additional improvements. It is now made with a low expansion Quartz mirror to maintain optical accuracy as the temperatures drop. The main body is cnc machined from a solid piece of aluminum. The eyepiece and insert tubes are identical to the original non-quartz version featuring a tapered safety on the nose-piece, a brass compression ring on the eyepiece tube and a rubber grip.
Star diagonals are a critical component of any refractor. The performance of an otherwise excellent telescope can be seriously compromised using a diagonal that is misaligned or pinched. We researched diagonal design and fabrication for two years before introducing our first 2” dielectric diagonal. We studied more than 20 diagonals on the market and discovered that 18 of them were either misaligned or pinched! This causes astigmatism and reduces optical performance.
The D1040Q diagonal is adjusted and tested for alignment and will preserve the exceptional quality of your Stellarvue telescope. Since the D1040Q is adjustable, it is the most accurately aligned diagonal we offer.
|Vic designed this over a two year period with the goal of ensuring a perfectly aligned, non-pinched system.||The dielectric coating reflects 99% which means brighter, higher contrast views.|
The D1040Q is cnc machined from a block of solid aluminum. The 2" tapered insert tube and the 2" compression ring eyepiece tube are cnc machined in our shop in the USA with an over-sized threads for a slightly wider clear aperture. The biggest difference is our ability to dial in alignment so it is precise. Misaligned star diagonals cause on-axis astigmatism degrading the performance of your otherwise perfect optical system.
Several years after you purchase your D1040Q Star Diagonal you may want to remove the mirror to clean it. You may do so with Acetone following the directions we provide. We will soon offer a video showing how this is done and what makes the Stellarvue Star Diagonal the one to have!
Here is a comparison of our D1040Q star diagonal compared to our import diagonal the D1028ECF. Notice that the Quartz mirror expands and contracts up to 12 times less than the standard H-K9L glass. The Quartz mirror remains stable under extreme temperature changes!
|SPECIFICATIONS||MODEL D1028ECF||MODEL D1040Q|
|ASSEMBLED IN||CHINA||U.S.A. (STELLARVUE)|
|GLASS TYPE||H-K9L||LOW EXPANSION QUARTZ|
|THERMAL EXPANSION||7.1 X 10 (16)/K||0.57 X 10 (16)/K|
|ACCURACY||1/10 WAVE||1/10 WAVE|
|CLEAR APERTURE||43 MM||45 MM|
|2" TIGHTENING||LEVER LOCK||COMPRESSION RING|
|1 1/4" TIGHTENING||COMPRESSION RING||COMPRESSION RING|
|WEIGHT||17 OUNCES||20 OUNCES|
9 Reviews Hide Reviews Show Reviews
Great diagonal !
I tested the diagonal last night, optics quality is nothing but perfect. No glares, and couldn't discern any image distortion or fainting. Beautiful.
Love the craftsmenship
High quality diagonal
Went with this diagonal because it was the most expensive Stellarvue has and was highly recommended. Not having years of experience using diagonals all I can say is the views are crystal clear and of course the build quality is top shelf. It's a pleasure to have this component in the visual light path on my SVX 102T-R scope.
The diagonal should be as important as the main objective .Bringing the object to focus is critical at this point, not to mention the importance of a quality eye piece
Quartz dialectic star diagonal
I have not had a chance to look through it just yet, but the build quality is top-notch.
Can’t wait to get it outside, and I am confident that I won’t be disappointed.
I will update when I get to evaluate it.
It arrived at my door faster than expected!
Quartz Dielectricc Star Diagonal
It's a great product. I got tired of swapping diagonals between refractors, so I purchased this diagnonal for my SV 105. Stars are sharp and worth the money. Nuff said
Quartz Dielectric 2" D1040Q
Very nice piece of maching work, fits snug and works very well.
2" Quartz Diagonal D1040Q
High quality product, excellent results.
Dependable performance from Stellarvue D1040Q diagonal
. The Stellarvue diagonal D1040Q was received very well packed for safe arrival. It came with an excellent adapter to allow the use of both 11/4" & 2" eyepieces. It comes with an instruction booklet. Evaluated using my Stellarvue SV115T20 apochromat. The diagonal is sturdily built and very high quality. Straight through performance with eyepiece versus eyepiece + diagonal indicated no loss of performance either in brightness or sharpness of image, high contrast levels retained. Eyepieces used FUJIYAMA HD-OR25mm; PENTAX 20mm & ED5.2mm. The jewel box and Jupiter were used in the evaluation. Air temp 10 degrees C. Jupiter showed a wealth of detail including the giant red spot and 4 jovian moons,as tiny orbs. The jewel box was ultra sharp with the individual colour of the stars of this compact cluster very clear and distinct with beautiful contrast. I can highly recommend the Stellarvue D1040Q for those individuals seeking a no compromise diagonal for use with the highest quality instruments and eyepieces.