Question about Tasco WC154550 Spotter 15-45X50 W/ Tripod

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Focal adjustment is sticky

Scope has been stored and focal adjustments are sticky. How can they be cleaned and restored.

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Posted on Jan 02, 2017

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SOURCE: zeroing scope adjustment

First, adjust wind-age and elevation to center or zero position. Remove your scope from the gun and make sure that the scope mounts are aligned, this is critical. Purchase an alignment tool is necessary. Then remount the scope. The scope should seat in the mounts without binding. If it does bind, the mounts are not aligned.
Start sighting in at close range,10 to 30 yards, then move out to 100 yards.

Posted on Jan 25, 2009

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miket756
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SOURCE: i tried to remove adjustment caps from my scope to

this is what happens when there done up to tight,
get a soft jaw vice and put the thred of the turret into the SOFT JAW VICE!!! (lined with leather),,,,
very gently grip the threds and undo the cap,,,
when refitting the bottom bit to the scope put a small blob of grees on the bearing part,,,oh,,by the way!!,,,
it should be regased! or it could fog up on you when it gets cold,,, only just nip up the turret caps next time

Posted on Nov 16, 2009

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1 Answer

How do you set the finder scope on the Starview 150EQ. I have no adjustment options and it is not in line with the main telescope alignment. The instruction manual is totally inadequate.


Place a wide angle, that is longer focal length lens in the scope in daylight and focus it and centre on some distant object, a tree, blg, tower etc.

Then use the adjustment screws on the finder to centre it on this same object.

Change to your next higher power lens, that is shorter focal length, refocus and centre, and repeat with the finder adjustment.

Next wait for evening and a bright star or planet to appear and centre it in the finder first this time. It should be somewhere near centre in the lens also. Centre it properly in the lens and make a final adjustment on the finder.
.

Dec 30, 2016 | Optics

1 Answer

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

1 Answer

I cannot focus my se8


That is a good telescope. I am unsure about what adjustments you are trying out, so please excuse me if I get too basic here:

The focus adjustment will not give you an enlargement, it only brings objects to a sharp image. I trust that is OK for you.

To gain an enlargement of something, you must use a different eyepiece with a shorter focal length, say from 25mm to 12mm. The magnification you will get is the focal length of your scope, 2032mm, divided by the focal length of the eyepiece, say 2032/25, giving you magnification of x81 with that eyepiece.

There is a practical limit to this, which for your scope is about x400, (an eyepiece of 5mm) in excellent conditions at the top of a mountain. For terrible seeing from a suburban backyard, it will be say half that, x200, or an eyepiece of 10mm. You will get the best viewing with a magnification of say x150 at the most, or an eyepiece of 15mm. Less is more.

Then, you will not ever see the true disk of a star with that scope, they are too far away. You will however magnify the image of a planet, star cluster, nebula, or binary star pair. Sometimes though that will be at the cost of image clarity, it depends on where you are at the time.

Mar 17, 2012 | Celestron NexStar 8 SE (480 x 203mm)...

1 Answer

I Bought a vivitar 60X by 120X telescope. I can see things closer only through the scope finder which is attached at the top of the telescope but nothing through the bigger lenses which have 2 focal...


YOU MUST first line up the finderscope with the main tube--

Get the top of a telephone pole in the main tube's eyepiece. Without moving the scope adjust the cross-hairs of the small finderscope so they line-up on the same object.

Feb 08, 2011 | Optics

1 Answer

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

I have the 6x18x65LU atn rifle scope. I had the scope mounted to my 30-06 on two 1" weaver rails. the scope keeps sliding forward though the adjustable scope rings. I've been recentering the scope and...


be cearfull you dont crush the scope tube,,but try rapping a little strip of sticky rubber or plastic tape round the scope tube then nipping the scope ring caps down onto this,,,but i think your scope rings are worn out or the wrong size,,ie 30mm not 25mm
i have air rifle scope's on my 7.62/308 and on my 303 none of them move about at all and they have stayed on zero for years now!

Aug 25, 2010 | ATN 6-18X65LU Daytime Rifle Scope

1 Answer

Leopold VX11 power adjustment really hard to turn


Take the eyepiece off and clean out the threads with wd-40 or something like that, put on some fresh, light weight oil, a little, and see if it doesn't spin a little better. Sometimes the oil gets gummy and sticky. Hope this helps.

Apr 09, 2010 | Leupold 3 - 9 x 40mm VX-II Series...

1 Answer

The adjustment knob was very hard to turn. Any way to lubricate?


I would be inclined to use a penatrative aerosol lubricant (like WD-40) in very sparse quantities. Squirt a little in using the WD40 smart straw applicator to direct the lube accurately and work the adjuster back and forth in a small section. Repeat this until you have freed up the adjustment from one end of its scope to the other. The focal adjustment is typically housed separately to the lenses and careful application of the lube should not affect them - avoid overusing the lube and have a mopup cloth under the spray zone to keep overspray/drips to an absolute minimum.

Aug 18, 2009 | Bushnell ImageView 111025 Binocular

3 Answers

When you zoom your scope does the impact point change on the target? is that when you use mil dot?


No, the cross hairs remain fixed. The zoom serves only to magnify the field of view.

Aduz

Mar 25, 2009 | Tasco Target/Varmint 6-24x42mm Rifle Scope...

2 Answers

Lost manual for trophy scope 3-9x40 rifle


There is no manual for elevation and windage adjustments. (at least not one that comes with your scope; all your scopes manual will say is whether its FFP or SFP (First Focal Plane or Second Focal Plane, the scale used on your scope for mil dots)(you can get this info by finding a store that sells this scope and asking a sales rep)

To adjust for elevation and windage you have to take into account the daily factors (unless your shooting in the same indoor environmental controlled shooting range each day you SNOB! jk

The formula takes alot of variables into account and is known as Exterior Ballistics

!) Environmental Factors - First thing you account for.

A) Elevation from sea level plays a large part into your environmental adjustments. Your elevation from sea level determines largely the Barometirc Pressure but it also varies slightly with Temp and Humidity (Major Factor)

B) Temperature - The temperature can affect the density of the air. The hotter it is the thinner it is and therefore less resistance and a higher bullet trajectory (Minor Factor)

C) Humidity - This again will affect the densify of the air infront of your bullet (Minor Factor)

D) Barometric Pressure - The other large factor in air density this is the base stat that the others modify

These all combined create a ratio that you apply to standard MOA (windage and elevation adjustments) to obtain the shooting information for that particular environment)



2) Bullet Factors (Listed on the Box you buy) - There are a few bullet factors to take into account.

A) Speed - the bullets feet per second can vary as much or more than 500 feet per second with the
same caliber ammunition.
B) Grain - The Grain of an ammunition is a measure fo its "Sectional Density" or weight to volume
ratio
C) Ballistic Co Efficient - This number is the measure of the bullets ability to maintain its speed
during flight. This also varies from Grain to Grain


These factors are complex and a pain for the best of shooters to determine. adding to that confusion. there are many ways to determine a bullets ballistics coefficient and each one gets a different number. In this case bullet data is best retieved from the manufactuerers box and take their word for it.

3) Lastly you account for shot factors.

A) Range - by referencing your standard elevation MOA adjustments and mutliplying by the ratio for environment the Elevation MOA is achieved.


B) Windage - Windage is done in inches per mile per hour then is multiplied by the Mph of the wind.
In order to be precise the windage is done in inches instead of MOA. it needs to be converted heres and example.

You Ballistics Cheat Sheet for the day says the windage at 900 yards is 5.2 Inches per mph of wind.
you apply the ratio for your environment .90 (all example numbers. this number would represent a shooting environment with an air density lower than standard/ the cheat sheet's known MOA adjustments). the 5.2 inches is multiplied by .9to acheive 4.68?? idk the point is you mulitply that by the wind of 10 mph to achieve a total of 46.8" of wind drift to the target.

now for the conversion to MOA. 1 MOA is eqaul to 1.047" per 100 yards. meaning for every 1 moa you adjust the bullet will move 1.047" per 100 yards (our target is 900 yards; meaning that each MOA for this target is 9*1.047" = 9.423" per MOA adjustment. so take that number and divide our total wind drift by it. ie 46.8 / 9.423 = MOA Windage Change of 4.9665... now you need to know whethere your scope is 1/4 minute clicks or 1/8 minutes (how many spaces between large numbers?) you would adjust to 5 MOA for a 1/4 minutes scope equaling 20 clicks on an 1/8th minute scope it would be 40 clicks.

This is the math of shooting. to learn how go to
WWW.shooterready.com they are an excellent sight to get the math down WITHOUT wasting ammo. Once you have the math you an transfer it to your gun. waste a few rounds checking it out and youll be hitting targets @ 1800 yards in no time

I like to take the simple way after i learned how to do the hard way

There is software tha will do the exterior calcualtions for you.

if your interested i use Sierra Infinity V6 Ballistics Software

GL


Dec 08, 2008 | Bushnell Trophy 3-9x40 Rifle Scope, Matte...

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