A collimating lens system is generally comprised of a tube and one or more lenses. By selecting optimal lens and focal distance properties, it is possible to collimate light with high accuracy. The lens can be attached to the measurement device directly or a fiber connection can be used to ...
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A refractor telescope has a glass objective lens as the main focusing unit to collect light at the front of a long tube. This lens is usually made up of two or more lens elements where light is bent (or refracted), as it passes through the tube, to produce a clear image and reduce ...
Hence I present The Beast. Visual or imaging.A big makfor the planets and smaller DSOs (0.5 degree field). With aAPOfor the wide field stuff (4 degree field). Adigital finderscopeon top (no more twisting your neck). A mount that does doaccurate GOTO, complete with plate-solving and a...
in front of the lens. You can also purchase Barlowed lasers from commercial sources such as Howie Glatter and Kendrick Astro Equipment. Unlike a plain laser, the Barlowed version works very well and avoids the pitfalls of the former. This is my favourite method for collimating in the dark....
4) due to the lens being off axis the light returning does not coincide with the original star image, has diverged and is now larger and dimmer due to being a reflection. I actually played with a similar effect with my laser through a variable polarizing filter such that it acted as lase...
radius y2 = θ1f and divergence angle θ2 = y1/f. Note that, no matter what lens is used, the beam radius and beam divergence have a reciprocal relation. Thus, if the focal point were to be infinity, that would result in the ray angle being zero, thereby collimating the beam of ...
(no screw to fix the dew shield so have now resorted to putting a thick elastic band around the scope to stop it from slipping. No-where to mount a finderscope, and the soppy little foot supplied with it does not allow for balance, plus difficult to get your fingers on the focusse...
The Meade LS6 is about as bad as it gets for some branches of astrophotography, most notably deep sky, which is what you'd do with a DSLR. It is on an alt az mount so it tracks the sky but has the object rotate in the field as it does so. You need an equatorial mount for de...
I don’t mind collimating the primary each time. Only once in awhile when it’s way off to begin with does it take a lot longer. Here’s that mod thread for these scopes if you haven’t seen it. It’s very long but I’m sure you can find some upgrades there to keep you busy...