Construction Scientific Calculator

[44 x 11 x 9"] Exquisite optics and mechanical construction. Built to the level of quality expected in professional scientific instruments. 85mm aperture is perfect balance between portability and adequate light gathering power for most viewing situations. Haven’t used it much yet because of winter weather, but views of M42 exhibited high contrast with excellent resolution of 4 Trapezium stars at 67x. Views of the moon are very crisp and richly detailed along the terminator.

Exquisite optics and mechanical construction. Built to the level of quality expected in professional scientific instruments. 85mm aperture is perfect balance between portability and adequate light gathering power for most viewing situations. Haven’t used it much yet because of winter weather, but views of M42 exhibited high contrast with excellent resolution of 4 Trapezium stars at 67x. Views of the moon are very crisp and richly detailed along the terminator.

[0.06 lb] I tried a very fancy and highly scientific lens cleaner from Edmund Scientific, but it left streaks. In fact, I thought maybe the coating had been removed in places. As a last ditch effort, I bought this and sprayed it on and it turned out that the coating is fine and the lens is now clean.

I tried a very fancy and highly scientific lens cleaner from Edmund Scientific, but it left streaks. In fact, I thought maybe the coating had been removed in places. As a last ditch effort, I bought this and sprayed it on and it turned out that the coating is fine and the lens is now clean.

[Knob] This calculator is beautiful, stylish and perfect. Item exceeded my expectations. I would purchase again.

[3.5 x 2 x 0.1"] The battery is for an older calculator. Back of the calculator indicated a different battery. After opening the calculator took the old battery out and the new one from B&H in it's place. Simple fix.

[0.35 lb] Most ND filters do not block IR at the level suggested by their rating so images are overexposed if you use an LE calculator. These Firecrest ND filters are great for long exposure IR shooting with the resulting exposures very near what the calculator suggests.

[Yes] Terrific Keyboard. Being that I am an accountant, I love the calculator button on the upper righthand side of the keyboard.

[Mechanical] I've been using this for work for a few months now and it's been working great. I set a programmable key for the calculator app which I use frequently. With use of 8 - 10 hours a day the batteries have not needed to be changed. The mechanical keys are much more accurate that the standard I've been used to using. Much easier to type on.

I've been using this for work for a few months now and it's been working great. I set a programmable key for the calculator app which I use frequently. With use of 8 - 10 hours a day the batteries have not needed to be changed. The mechanical keys are much more accurate that the standard I've been used to using. Much easier to type on.