All I was trying to say is that when Barlow mag is blank or zero Excel shows a division by zero error, so if you fill 1 in the Barlow mag column that will resolve it. 🙂

Telescopemagnification calculatorwith Barlow

All I was trying to say is that when Barlow mag is blank or zero Excel shows a division by zero error, so if you fill 1 in the Barlow mag column that will resolve it. 🙂

I posted this purely out of my desire to help others where I can and because I hadn't seen any readily available to newcomers.

I could do the math on the phone but as I'm considering several eyepieces in the future it's nice to be able to see at a glance up to 10 possibilities at the same time and compare them. No point in having focal lengths to close together is there?

Two lensmagnification calculator

BTW, have you seen the calculators that FLO have created at https://astronomy.tools/calculators/magnification ? I am not sure they have a calculator for exit pupil but there is mention of exist pupil on this page

Eyepiecemagnification calculator

Hi everyone, I've made a simple excel spreadsheet calculator for eyepiece Mag and exit pupil size it also allows Barlow magnification to be calculated.

You simply type in your objective  or mirror diameter in mm and the focal length of your scope in mm and the focal length of the eyepiece that you are looking at or considering and the sheet will calculate your magnification and exit pupil size. If you are using a barlow type the mag of the barlow (eg for a 2x barlow type 2 in the box under Barlow mag X) and the sheet will calculate the revised magnification and the size of the exit pupil too.

Useful for calculating exit pupil. You might want to default the Barlow mag value to 1 so that you dont get DIV/0 errors.

I just thought some newer members might also get some benefit from it. You won't need to have excel on your device to be able to use it as it will work in your Google Chrome browser window.

Lensmagnification calculator

BTW, have you seen the calculators that FLO have created at https://astronomy.tools/calculators/magnification ? I am not sure they have a calculator for exit pupil but there is mention of exist pupil on this page

No, I hadn't seen any calculators for exit pupil so decided to make my own. Just thought Iwhilst I was doing it that I'd share it with anyone who may want to use it.

Lensmagnification calculatorfocal length

Magnification Calculatormicroscope

Hi, many thanks and I really appreciate your kind comments but Ill just be happy if a few newcomers find it a useful when they're considering buying eyepieces as that's the reason I made it for myself.

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Magnificationformula Biology

Useful for calculating exit pupil. You might want to default the Barlow mag value to 1 so that you dont get DIV/0 errors.