Question about Tasco Scope Guide Quickly Zeroing Rifle Scopes 28ac

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4-16 range finder old tasko scope needs adjusted up and down. How do I?

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How to adjust the finder scope


Mount the finder securely on the main scope tube, and make sure each of its adjusting screws is at about mid-travel (BTW a lot of finder scopes have a rubber ring fitted between the finder and its mounting tube. If this is missing a rubber band is a good substitute).

Place a low power EyePiece in the scope (this will be the longest focal length EP you have), and then in daylight, find a distant object like a tower or distinctive treetop. Swing the scope and center this object in the EP (it will be upside down in a standard EP). Then center it in the crosshairs of the finder.

Change to a lower focal length EP (more powerful) and repeat this procedure . Then at night, swing the scope to an obvious target like a planet or a bright star, and repeat the procedure until everything is centered. If you handle and store the scope carefully between observing sessions there will not be much correction needed next time.

Mar 24, 2015 | Vivitar Optics

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I have a new Brookstone compact telescope. The image in the smaller viewfinder is upside down making it difficult to line up with image in main telescope. Is this normal? And if so, any suggestions for...


Astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear. It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one, but one wouldn't bother to do this with the small finder scope.

Telescope manuals recommend that you align the finder scope in daylight, by pointing the main scope at an object on the horizon and adjusting the finder to match (never point a telescope toward the Sun!). Once you have a tree or mountain peak in the center of the main scope's image, you can then adjust the screws around the finder scope to get the crosshairs (or red dot) centered on the same object. It is very difficult to do this job in the dark, especially as objects in the sky are constantly on the move.

Jan 22, 2011 | Optics

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I cannot see anything and what is the finder scope on top for?


New telescope users are taken by surprise at the difficulty of just pointing the telescope in the right direction to see anything. The field of view is quite limited, especially if you are using a high power eyepiece. The higher the power of eyepiece on a telescope, the dimmer the image, the more difficult to aim it at any chosen object, and the more difficult to focus. When the scope is not focussed, even if there are stars in the field of view, they will only be faint blurs.

It is best when you are starting out with a telescope to try it with the least powerful eyepiece (the one with the highest number) to begin with, until you become more familiar with how it works. Do NOT use the Barlow lens if one came with the scope.

The finder scope is meant to help you get the main scope lined up on the object you want to view, but it won't be any use in pointing the telescope until you adjust it to precisely line up with the main scope. Telescope manuals recommend that you do this in daylight, by pointing the scope at an object on the horizon and adjusting the finder to match (never point a telescope toward the Sun!). Once you have a tree or mountain peak in the center of the main scope's image, you can then adjust the screws around the finder scope to get the crosshairs (or red dot) centered on the same object. It is very difficult to do this job in the dark, especially as objects in the sky are constantly on the move.

You will find that there is a very wide range of movement in the focus mechanism, because different eyepieces focus at different points, but the actual focus range for any eyepiece will be a small part of the overall range afforded by the focusing mount. It is much easier to familiarise yourself with this in daylight.

At this point you will learn that astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear. It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one, but one wouldn't bother to do this with the small finder scope.

Once you have done the above, you can try the scope at night, on an easy to find bright object like the Moon. Looking at random stars will probably be disappointing, as they don't look different under magnification. You will have to find planets, star clusters or nebula to see anything interesting. You will also find the the object you are looking at swims out of the viewing field, and you must continually move the scope to follow it. This will be more pronounced at higher magnifications. Again, use the least powerful eyepiece. Small scopes are often advertised as having unrealistic powers (300, 500) which can never be practically achieved. You just get dim blurs.

There is an excellent website for beginner telescope users at THIS LINK

Jan 06, 2011 | National Geographic 76AZ (525 x 76mm)...

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I have a Barska telescope. Model: 60800. Diam: 60mm Focal length: 800 mm. I think I put it together correctly, but I can not see anything through it... just black. Yes, I have taken the cap off the...


The power of the scope will be the focal length of the main objective (yours is 800mm) divided by the focal length of the eyepiece, so a 9mm eyepiece will give a higher magnification (and be dimmer and harder to focus and find objects) than a 20mm eyepiece. It is usual to have two or three different focal length eyepieces for viewing different objects.

Starting out, you want to use the lowest power, so the highest number, eyepiece. Do NOT use the Barlow lens if one came with the scope. Try it out during the day (but never point a telescope anywhere near the Sun). This will make it easier to find the focus point. There is a very wide range of movement in the focus mechanism, because different eyepieces focus at different points, but the actual focus range for any eyepiece will be a small part of the overall range afforded by the focusing mount.

It is unlikely that the finder scope will be much use in pointing the telescope until you adjust it to precisely line up with the main scope. Most manuals recommend that you do this in daylight, by pointing the scope at an object on the horizon and adjusting the finder to match. Once you have a tree or mountain peak in the center of the main scopes image, you can then adjust the screws around the finder scope to get the crosshairs centered on the same object. It is very difficult to do this job in the dark, especially as objects in the sky are constantly on the move.

Remember that astronomical telescopes usually show an upside down image. There is a good reason for this- erecting the image needs more bits of glass in the light path, which reduces the amount of light and increases aberrations. Even if this is only slight, astronomers prefer to avoid it, and they don't really care which way up the Moon or Jupiter appear. It is possible to fit an erecting prism or eyepiece to most astronomical telescopes, and some of them come with one.

Dec 31, 2010 | Optics

1 Answer

Leupold VX II 3x9x50mm scope on a rem. 270. One year old. Worked fine last year. Sighted in last week at range. Windage was dead on. Wanted to move up 1 inch in hieght at 25 yards. Tried to adjust hieght...


16 clicks is about 4" at 100 yards not 25. did you try shooting it at 100 yards? remember the scope is mounted at least an inch and probably higher than that above the barrel. at close range you will always hit low with a scope because the bullet has to climb at least an inch or more before it will be right on at 25 yards. if it is dead on at 25 it should hit way high at 100. (or the scope/ mounts are bad).

Nov 05, 2010 | Leupold ® Rifleman® 3-9x50 mm Scope

1 Answer

I have quite an old tasco telescope. we can see the target star/planet with the finder, but when we switch to look thru the magnification, we see only black. the lens cover is off. dod you ahve any...


You have NOT lined up the finder scope with the main tube. Point the scope at the moon or a bright star and get the moon or the star into the main tube's eyepiece.

Without moving the scope adjust the screws on the sides of the finder scope and center the crosshairs on the target. Now you can use the finder to line up the main tube.

Sep 28, 2010 | Tasco Optics

1 Answer

How do you use the range finder on your


You have to sight it in and then insert the ring for the specific ammunition and distance you are using. From then point on, you can dial in the distance and the cross hairs will be right on.
It isn't an actual range finder, it's a bullet drop compensator.

Mar 06, 2010 | NcStar Illuminated A.O. Rifle Scopes -...

1 Answer

Mastere mildot solutions


Mildot sight scopes are NOT range finders unless it is etched into the scope itself. You will need to buy a range finder that is separate.

Jan 09, 2010 | Bushnell Trophy 3-9x40 Rifle Scope, Matte...

1 Answer

Adjusting Range on Redfield Scope


There should be a set screw or screw that you can loosen to make that adjustment. Once you have it where you like it, just tighten it back up and enjoy you ability to make those quick adjustments when needed.

Mar 29, 2009 | Optics

2 Answers

I need a owners manual for bushnell 4-12x42 scope/range finder


Hi :) For some reason your manual and device was under the range finder section (i figure it would be under rifle scopes with a range finder section

Click Here to view your manual

NOTE to view this manual you will need a PDF viewer on your computer if you do not have Adobe,
there is a free ware software PDF viewer called Foxit v3 Build 1560 that you can download Here from their site

If you need any help comment

please rate this as fixya! ;)

Brad

Mar 27, 2009 | Barska Optics Barska 10-40x50 Ao Varmint...

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