Chefgage Posted February 26, 2017 Share Posted February 26, 2017 Hello everyone. I have a cheap telescope that i have been using for the past year but looking to upgrade soon. Anyway the scope i have is a celestron powerseeker 60AZ. I have just got myself a copy of the sky and telescope pocket sky atlas. I know a good idea is to have a ring of some kind such as a metal ring which you can use with the atlas to show what you will see through your finderscope. Question is does anyone know what the true field of view in degrees my finderscope has? Its a 5x24. I know i can look through it and see what stars are on the outer edges and compare that to the atlas to give the answer but i was just wondering if anybody knows the answer of the top of their head. Thanks. Link to comment Share on other sites More sharing options...
Mr Spock Posted February 26, 2017 Share Posted February 26, 2017 At a guess around 10°. Most inexpensive eyepieces will have a field of view of 50°; with a magnification of x5 that gives 10° Link to comment Share on other sites More sharing options...
jambouk Posted February 26, 2017 Share Posted February 26, 2017 If you can't find the answer, just look through it in doors with something like the edge of the TV on the left of the FoV and then note what is on the right side of the FoV. Then from your position mark out the two lines of sight with bits of string then measure the angle. James Link to comment Share on other sites More sharing options...
JG777 Posted February 26, 2017 Share Posted February 26, 2017 I am pretty sure that somewhere on the first few pages of S&T these scales / sizes are actually shown? Link to comment Share on other sites More sharing options...
Chefgage Posted February 27, 2017 Author Share Posted February 27, 2017 15 hours ago, jambouk said: If you can't find the answer, just look through it in doors with something like the edge of the TV on the left of the FoV and then note what is on the right side of the FoV. Then from your position mark out the two lines of sight with bits of string then measure the angle. James I will give this a go and compare my results to the 10 degrees quoted above Link to comment Share on other sites More sharing options...
Chefgage Posted February 27, 2017 Author Share Posted February 27, 2017 13 hours ago, JG777 said: I am pretty sure that somewhere on the first few pages of S&T these scales / sizes are actually shown? There is a scale guide on the cover page which if you know your field of view of your finderscope can then be used to make a ring of some sort. Just need to find out the value for mine in degrees to start with Link to comment Share on other sites More sharing options...
BXRO Posted February 27, 2017 Share Posted February 27, 2017 The size of the template will depend on the scale of the map as well, easiest way is to pick a constellation like the plough and observe the maximum separation that you can see between any two stars, then transfer this observation to the sky chart, picking the same stars this will be the approximate size of the template you will need. You can calculate it if you want, but for your requirements the practical method will be more than adequate Link to comment Share on other sites More sharing options...
Chefgage Posted February 27, 2017 Author Share Posted February 27, 2017 15 minutes ago, BXRO said: The size of the template will depend on the scale of the map as well, easiest way is to pick a constellation like the plough and observe the maximum separation that you can see between any two stars, then transfer this observation to the sky chart, picking the same stars this will be the approximate size of the template you will need. You can calculate it if you want, but for your requirements the practical method will be more than adequate I will try this as well. Although not sure when, i have not seen a clear sky for days! Link to comment Share on other sites More sharing options...
cloudsweeper Posted February 27, 2017 Share Posted February 27, 2017 An easy way to get a rough idea of the FOV through your finder is to get Orion's Belt in view. There are about 3-and-a-third degrees between Alnitak and Mintaka, so try and judge it from there! Doug. Link to comment Share on other sites More sharing options...
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