Question about C-Star Optics TT-150 Telescope

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Lens SR6 We are having trouble focusing and seeing objects using the SR6 lens. the H20 works well. Why can't the SR6 be focused as clearly as the H20? Kim

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That's because it is TOO MUCH magnification for that small aperture telescope. This is one of the most common problems for beginners. They believe that you need a lot of magnification to see objects in the night sky. In my 8 inch telescope I rarely go over 120 power -- magnification is the least important property of a telescope. Aperture and good optics are much more important.

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Posted on Jul 09, 2011

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How to use Nikon Pk-3 extension tube?


It should work with just about any lens, though it works best with moderate focal lengths (say about 24mm to 200mm). Its primary purpose is to let the lens focus much closer than normal.

When you say "no results," do you mean it's not letting you focus closer? Mount the tube on the camera, mount a lens on the tube, then focus the lens to its minimum focus distance. Looking through the viewfinder, move closer to an object until it comes into focus. Does it come into focus? How close? What lens(es) are you trying?

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I am inexperienced at this, attempting to enjoy this with my grandsons...When using the diagonal mirror, what is the difference in using the H20 eyepiece and the SR6 eyepiece? When using the 1.5x Erecting...


The numbers on the eyepieces are the focal length in millimetres. You can calculate the magnification of the telescope by dividing the focal length of the main objective by the focal length of the eyepiece in use, so if the main focal length is 700mmm and you use the H20 (Huygens 20mm) eyepiece, you will get a magnification of 35. The SR6 ( Symmetric Ramsden 6mm) would give about 117 magnification. You will find that the LOWEST magnification is about the only one that is usable. I wouldn't use the Barlow at all.

There is a good website full of info about this HERE

Dec 31, 2010 | C-Star Optics TT-150 Telescope

1 Answer

I am having trouble seeing through the 60mm Objective Lens. I'm able to see clearly through the Finderscope. Also how do attach the Barlow and Erecting Lens?


You put the prism into the focuser and then the eyepiece with the largest number written on it. DO NOT USE the 2x barlow until you learn how to focus properly.

Dec 27, 2010 | Bushnell Deep Space 78-9512 (120 x 60mm)...

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Why should the coarse focusing knob not be used when focusing with the higher-powered objective lenses


There are two reasons. One reason is that when on high power you are working so close to the glass slide that it is easy to misjudge how much you are moving the specimen toward the lens that you can break a slide before you realize it. The coarse focus moves the stage with the specimen on it very fast and you only have a very very short distance within the focus plane before you run the objective lens into the slide.
Secondly, it is just harder to control the minute adjustments needed at the higher powers with the "coarse" focus knob. If you start at the low magnifications find what you want to concentrate on with the coarse focus knobs and then work your way up to the higher powers, you will have very little trouble moving to the fine focus controls at 40x and 100x while still having control of your image.

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2 Answers

My 50 mm 1.4 won't focus on closer objects only far away now after my mom dropped my camera. What can be done? Is it most likely broken?


yes thats a fair bet,,, it could only be the lens that took the brunt of the smack it had and its now jamming when you try to focus up on close ups,,,
try a difrent 50mm lens on it and find out if im right

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How do you use it ...in laymans terms....settings etc. thanks


Your question ( in laymans terms) is unclear! But I will make a guess as to what it is you ask.

The 100-400mm is the focal length of the lens, To use it it has to be attached to the camera It it is capable of focusing clearly on an object at its maximum output as well as its minimum. At its maximum focus it can perhaps ( depending on optical quality) bring an object 4-5 Kilometers into clear view. Most lenses have a zoom factor and a focus ring. Experimentation with the lens will be a better way of defining what improvements it has over a standard 50mm lens

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Sep 12, 2009 | Canon Cameras

1 Answer

I can't get the macro adapter to work ?


Put the macro adapter on the camera and move the camera in and out from an object to try to focus the object in the display. Remember, macro is very small, very close and very small field-of-focus. I hope this helps.

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1 Answer

Focus with polarizing filter


No, the problem is not with the lens. Your Canon camera requires unpolarized light to focus. Even on manual focus, you may have trouble seeing focus through the viewfinder. That's why they invented circular polarizer.

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2 Answers

Trouble focusing with sigma 70-300 DL macro super lens


It will not focus on anything closer than 5 feet.

(From Sigma lens literature)
Capable of macro photography, this lens has a 1:2 maximum close-up magnification at the 300 mm focal length. It's the ideal high performance lens for portraits, sports photography, nature photography, and other types of photography that frequently use the telephoto range. It also has a switch for changeover to macro photography at focal lengths between 200mm and 300mm with a maximum close-up magnification from 1:2.9 to 1:2. The minimum focusing distance is 1.5m / 59 in. at all zoom settings.

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3 Answers

Bushnell 18-1560 Telescope


Hello,
What you have is called a refractor-type telescope with the primary lenses (the Objective) at the top of the tube and the only other lenses in the system are your selection of eyepieces, probably a barlow lens (2X magnification of any eyepiece used), and a diagonal (in line mirror so that you cand see into the telescope from the side.). As the focal lenth of the eyepiece decreases, so does the distance away from the Objective Lens. I believe that you are using the telescope with a diagonal mirror which makes the optical path longer. The fact that your longer focal lenght eyepiece can focus and not your short one would be only if you didn't have the diagonal or the eyepiece all the way in tight to allow the focus mechanism (rack and pinioin) to get compressed enough to focus. Look at the Moon, if the image gets smaller then bigger as you focus, but not sharp, then I would have to tell you that your eyepeice lenses are not in the right order. Someoner may have taken it apart and didn.t put them back in the correct order. The lenese could just be very dirty also. Barrow a short focal lenght eyepice from a friend and see if it works in your system. Then you will know for sure.

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