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Barska information Hello, I have a Barska model 60900 Diam: 60 mm, focal 900 mm, I've misplaced my owner's manual, and software, I was wondering if you could help me with this. Thanks

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Barska is one of the many brands stamped on Asian made optics. Many of the models they sold were sold by Celestron and others. Go to the Celestron web sit and poke around in the download archives.for manuals and I'm sure you can find a manual that covers a model similar to your Barska. Start with the FirstScope series.

Their is a lot of excellent astronomy freeware available, just google for it.
Geo.

Posted on Jan 07, 2009

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If you had a compact camera it would say 10x zoom what is the equivilent in a 70mm -300mm tamron


A 35-80 mm lens is 2.3X zoom. Divide 80 by 35 and you'll get the result.

It is usually better to know what the focal length of a lens in "35 mm equivalent" is and judge by that, rather than relying on the "X" power of the lens. For instance, most point and shoot cameras start at about 35 mm and have either a 3X or 4X zoom. This would make it a 35-105 or a 35-140. I've seen some that start at 28 mm, though. A 3X starting at 28 mm is 28-84 and a 4X is 28-112. Neither one is a particularly strong telephoto lens and the 4X is just about the same as the 3X that starts out at 35 mm.

It's also important to realize that tradition dictates that lens focal lengths are usually expressed in terms of "35 mm equivalent," where "35 mm" refers to a 35 mm film camera. This is because of the relation between the sensor size and the actual focal length of the lens and the resultant angle of view of the lens.

I have one point & shoot that is actually a 5.8-24 mm zoom. This is a 4X zoom. The 35 mm equivalent is 28-116 mm. The sensor is 7.2x5.3 mm. (1/1.8") (And I wish I knew someone who could explain how the heck they came up with sensor size terminology!)

I have another point & shoot that is actually a 5.7-17.1 mm zoom. This is a 3X zoom. The 35 mm equivalent is 34-102 mm. "How could a shorter focal length give a longer 35 mm equivalent?" you might ask. It's because the sensor is only about 5x4 mm. (1/2.5")

I have a few Nikon DSLR's and - thankfully - they all have the same size sensor. They all have a "lens factor" of 1.5. This means that you just multiply the actual focal length of the lens to get the 35 mm equivalent and then you can make comparisons accurately from camera-to-camera. Most Canon's, for instance, have a lens factor of 1.6. On a Nikon DSLR, a 28 mm lens is the "35 mm equivalent" of a 42 mm lens. On most Canon DSLR's, the same 28 mm lens is the equivalent of a 45 mm lens.

These example are just to show you how freaking confusing it can all become if you try to make sense of the "X" power of a zoom lens.

Bottom line...

Check the 35 mm equivalent specifications for the lens. This way, you will be leveling the field and comparing apples to apples. More or less.

Jul 10, 2012 | Tamron 75-300mm f/4.0-5.6 LD Lens for...

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Harmony 900 Manual Download


Download Logitech Harmony 900 Remote Control Manual

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Have you misplaced your Logitech Harmony 900 Remote Control Owners Manual?

Would you like a digital, searchable, pdf version of the Logitech Harmony 900 Remote Control Users Guide?

Follow this link to download a pdf version of the operations manual.

I hope that helps.
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Harmony Mac Software Download
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on Apr 30, 2010 | Televison & Video

Tip

Harmony 900 Manual Download


Download Logitech Harmony 900 Remote Control Manual

5b3d12f.jpg

Have you misplaced your Logitech Harmony 900 Remote Control Owners Manual?

Would you like a digital, searchable, pdf version of the Logitech Harmony 900 Remote Control Users Guide?

Follow this link to download a pdf version of the operations manual.

I hope that helps.
__________________________________________
Logitech Harmony Firmware Update
Harmony Mac Software Download
Harmony Win Software Download
Logitech Harmony Safe Mode Fix
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on Apr 30, 2010 | Logitech Harmony 900 Remote Control

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I have misplaced my owners manual for my 2008 Mercury Marquis. I don"t know when to have car serviced


Hello fellow Grand Marquis owner...

Here is Ford's webpage for the 2008 Maquis manual, scheduled maintenance, and other owner information:

http://owner.ford.com/servlet/ContentServer?pagename=Owner/Page/OwnerGuidePage&year=2008&make=Mercury&model=Grand%20Marquis

Click on that link (or cut and paste it into your web browser's address bar) and click on the 'Scheduled Maintenance Guide' . This will open a .pdf file for you.

If you need this information again, go to Google and search for '2008 Mercury Grand Marquis manual'. Click on the link that contains 'owner.ford.com' in the address.

You have a very nice car, I hope that you enjoy it for years to come.

Good luck from Detroit, MI.

Nov 01, 2011 | 2008 Mercury Grand Marquis

1 Answer

Hello, I would like to know, how to change the '' units of measure? How to change feet to meters? Model: QT-206W depht Thanks Vini.


Hi Vini!

There is no "meters" option on your unit. Feet is the only unit of measurement available.

In case you've misplaced your owners manual, you can view/download it at:
http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/QT206om.pdf

Hope this helps

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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

I need the assembly instructions, please, for a Swift 60900.


I think I already answered your question--- look here for a MEADE manual that is similar to your telescope-- they all pretty much assemble the same way---

http://www.meade.com/manuals/index.html


Apr 08, 2009 | Optics

1 Answer

Looking for Owners / Operators manual for Acme MRS11 Dough Roller


I looking for a Owners/Operators manual for Acme DMX bench dough roller date 11-17-98 serial 1140

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