Question about Coronado SolarMax 40 Telescope

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40mm Solarmax Filter

I have an original Coronado 40mm Solarmax filter set. I don't know the BF size. Based on the price I paid, it sounds like a 5mm. When I ordered I told them It would be used on a Celestron C5. How can I determine the BF size?

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Howdy,

Measure the aperture of the output (eyepiece end) of the blocking filter. That diameter in mm determines the BF size.

That is not the only difference among all the bloacking filters but is the way to determine which one you have.

Regards, Marc

Posted on Dec 05, 2008

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1 Answer

Can I use this telescope to view the solar eclipse and if so, how do I do this safely?


Only if you have a white light filter. You can make one or you can buy one, I have done both.
Here are a couple of helpful links. The first one explains white light filters.
http://starizona.com/acb/basics/equip_filters_solar.aspx

This link is a place that sells the material.
http://www.astronomyalive.com.au/accessories-14/telescope-accessories/solar-viewing/baader-astrosolar-safety-film-custom-sized-white-light-solar-filter-material.html

Cheers .,. Bob

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sounds like bad filter not focases in corect ok i would return it cuse these are usally relly clear thx nick

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I have a new solarmax II 60 with the rich field tuning. The lever will not stay in one place especially when the scope is at an angle. Also I cant see that its doing anything to the image. When I first...


This is a VERY high dollar telescope. Something is broken with the "tuning" lever. Return it for repair. Do not take it apart.

Contact Meade:
http://www.meade.com/support/index.html

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1 Answer

NATIONAL GEOGRAPHIC TELESCOPE NG76AZ where can i get a solar filter and additional lenses etc for above 76mm telescope


Do NOT attempt to look at the Sun through a solar filter! These can crack from the heat and you will be blinded instantly.

Most telescopes use a standard fitting eyepiece with a 1.25 inch outside diameter barrel. You can measure the mount where the eyepiece goes to make sure that yours is this size, then search on eBay or Amazon for "1.25 eyepiece" and you will find many available. None of these will be made by National Geographic, but any make will fit.

The other variable will be the focal length of the eyepiece, which is what determines it's power. The power of the scope will be the focal length of the main objective 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.

You will find a large variation in prices, which is partly due to the difference in quality and type of construction of the eyepieces. Kellner eyepieces are simple and cheap, whereas Possl or orthoscopic ones are more complex and cost more. There are reasons why people will pay more for the better eyepieces. Avoid eyepieces marked with the letters "H" or "SR" before the focal length.

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1 Answer

Need eye filter for F-700 mm


You mean an EYEPIECE?

Several companies sell eyepieces for telescopes. They come in .965, and 1.25 inch sizes. Measure the hole in the telescope.

Here are two companies:

http://www.agenaastro.com/

https://www.highpointscientific.com/store/listCategoriesAndProducts.asp?idCategory=169


May 04, 2010 | Edu-Science (10166) Telescope

1 Answer

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You will NOT get 525 power from that small telescope. Yes I know the box said that but it was a lie.

An eyepiece might cost as much as you paid for the entire telescope. NEVER buy a telescope that advertises magnification on the outside of the box.

Here are some eyepieces:

http://www.agenaastro.com/Eyepiece-Size-s/128.htm

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1 Answer

40mm tasco refractor telescope.


Can you remove the eyepiece from the telescope--- if you can -- GOOD, throw it away and buy a new one on-line at these web sites--

Eyepieces come in 3 different barrel sizes-- .965, 1.25, 2 inch

Yours is probably either a .965 or 1.25 inch.

http://www.scopecity.com/category.cfm?frompage=1&StartRow=11&TopCategoryID=183&SubCategoryID=219&Sub2CategoryID=221&DisplayType=1&cn=Eyepieces%2CRepair%2CAccessories&FilterManufacturerID=0&FilterDriveDescriptionID=0&FilterMountDescriptionID=0&FilterScopeTypeID=0&FilterApertureInches=0&FilterApertureMM=0&maxrows=10

http://www.agenaastro.com/Agena-Wide-Angle-Eyepiece-s/47.htm

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1 Answer

I have a Coronado PST and can't seem to see anything through it??? I can get the sunlight in the finder window, but don't have any glimpse of an image in the lens. It is almost if there is something...


HI lyuen: its possible the finder scope/window is not aligned properly , or these type of scope need very careful focusing. otherwise it will be difficult to see the sun.
hope this helps.

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1 Answer

PST CaK, can't see any light coming through.


I don't know quite what you mean by the "finder" as it doesn't come with a finder scope but it sounds as if it wasn't pointed directly at the sun.

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