Category Archives: User Guides and Tutorials

Which type of binocular tripod adapter should I buy

Posted on August 23, 2012 by Reviewer

Binoculars are available as either Porro prism or Roof prism options. Most of which accept binocular tripod adapters. But which one should you choose. The choices are standard or slim. Standard tripod adapter. These are typically fine for porro prism … Continue reading →

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What binoculars do I need to see the Andromeda Galaxy

Posted on August 15, 2012 by Reviewer

Away from light pollution under dark skies, you may just be able to see the Andromeda Galaxy (M31) with the unaided eye as a small patch of light. A pair of small binoculars such as 7×50 or 10×50 will show it … Continue reading →

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Binoculars for spectacle wearers

Posted on August 15, 2012 by Reviewer

If you need to wear glasses while looking through a spotting scope, telescope or binoculars, you need an eyepiece with whats called long eye relief . Ideally you need this to be 17mm+ to get a comfortable full field of … Continue reading →

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What does field of view mean

Posted on August 14, 2012 by Reviewer

With many binoculars you will see numbers such as 86m @ 1000m, or 143m @ 1000m for examples. So what do these numbers mean ?. In the 86m @ 1000m, this means at a distance of 1000m you can see … Continue reading →

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How to make a filter cell /frame for Baader A4 solar sheets

Posted on May 23, 2012 by Reviewer

      The film must be mounted flat and free of any tension – Only this will provide first class Solar images. The quality of this patent pending material is so high that any wrinkles or strain on the … Continue reading →

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Will my National Geographic telescope accept 1.25″ filters ?

Posted on April 25, 2012 by Reviewer

National Geographic telescopes are readily available from a well known catalogue shop. The problem is that some of their eyepieces are not threaded to accept astronomical 1.25″ filters. This is not a problem if you don,t require additional filters. But … Continue reading →

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Binoculars FAQ. What does flat field mean

Posted on March 7, 2012 by Reviewer

Often in binocular reviews you will see the words flat field used in the description. So what does flat field mean ?. It simply means that focus is constant across the field of view. With some binoculars you will see … Continue reading →

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Are Bridge cameras suitable for digiscoping

Posted on March 3, 2012 by Reviewer

Are Bridge cameras suitable for digiscoping ?. Often at the Northern Optics retail outlet, or over the phone, customers will ask this question. As I always say, “I,ll be cruel to be kind” and say that Bridge cameras + digiscoping … Continue reading →

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Binoculars guide. How to check binoculars for correct collimation

Posted on February 28, 2012 by Reviewer

Obviously when you look through binoculars and you see a double image, it clearly means they are out of collimation (both barrels not aligned with each other). But in some occasions the error is very slight, and your eyes compensate … Continue reading →

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Telescope filter basics. #56 Green

Posted on February 15, 2012 by Reviewer

Although a #56 Green filter can be used as a Moon filter. I find that it is the best astronomical filter for enhanced views of Mars. With the #56 filter attached, the Polar ice caps stand out much more against … Continue reading →

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