Category Archives: User Guides and Tutorials

How to connect a 1.25″ eyepiece to a Zeiss Diascope

Posted on March 26, 2013 by Reviewer

Owners of Zeiss Diascopes can attach standard 1.25″ telescope eyepieces to the scope with the use of a Baader Diascope bayonet 31.7mm (1.25″) ocular adapter. (see image right) To use, simply insert a 1.25″ eyepiece in to the adapter, and … Continue reading →

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How to get dust off a telescope objective lens.

Posted on January 21, 2013 by Reviewer

If you find a few specs of dust on your telescope lens , they are best cleaned off with a blower brush or bulb blower. Do not try to wipe them off. As a rule of thumb, any small particles on … Continue reading →

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Skywatcher Light Pollution Filter. Wavelength chart

Posted on November 22, 2012 by Reviewer

The Skywatcher light pollution filter helps cut out mercury-vapour light. In other words, the light given off by street and house lights. The end result is that you can cut through the light pollution to aid views of the heavens. … Continue reading →

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How to connect a Skywatcher Light Pollution filter to a telescope.

Posted on November 12, 2012 by Reviewer

A frequently asked question at Northern Optics is “how do you fit a Skywatcher light pollution filter to a telescope”. The Skywatcher and many other filters screw on to the telescope eyepiece. There are other ways of connecting a filter, but … Continue reading →

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Hawke Endurance 65ED spotting scope. How to attach an SLR camera

Posted on October 10, 2012 by Reviewer

To attach an SLR or DSLR camera body to the Hawke Endurance 65ED spotting scope, you will need a small adapter ring (part number HX3729) and a T-ring. To fix to the spotting scope , unscrew the eyepiece twist eye cup anti-clockwise … Continue reading →

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Can you change the eyepieces on Helios Apollo binoculars

Posted on October 3, 2012 by Reviewer

The Helios Apollo range of binoculars have eyepieces that are threaded to accept 1.25″ astronomical filters. The eyepieces themselves can not be changed. The Helios Apollo binoculars are available in 7×50, 10×70, 15×70, 20×110 and 25×110. Image shows the 7×50 … Continue reading →

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Binocular basics. What is a binocular objective lens

Posted on September 18, 2012 by Reviewer

  A pair of binoculars has two main sets of lenses. The smaller being the eyepieces that you look through. The larger lens at the opposite side is called the objective lens. This can be made up of two, three … Continue reading →

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Celestron Nexstar SLT telescope. What does SLT stand for

Posted on August 28, 2012 by Reviewer

The SLT in the title of the Celestron Nexstar SLT telescope stands for Star Locating Telescope

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Who are Ostara. Binoculars and Telescopes

Posted on August 28, 2012 by Reviewer

Who are Ostara ?… That seems to be a frequently asked question on internet forums. Ostara products include Binoculars, Telescopes and astro accessories such as eyepieces and filters. Optical Hardware are the UK importer. Ostara got great magazine reviews, with … Continue reading →

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Digiscoping with a Canon EOS body and understanding f ratio,s

Posted on August 25, 2012 by Reviewer

When digiscoping  with a Canon EOS body on aperture priority , you will notice the f number shows as f0.0 rather than the usual f11, f8, f4 etc. This is nothing to worry about, and the camera will still give correct … Continue reading →

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