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Spectrum Full Aperture Glass Solar Filter for 92 mm - 98 mm OD Telescopes - ST400G
Spectrum Glass Solar Filter for 92 mm - 98 mm OD Telescopes
This Spectrum Full Aperture Glass Solar Filter fits the following instruments:
- Celestron 80 (older versions)
- Meade DS-70, ETX-80 AT-TC, DS-2080
- Orion ShortTube 80, Observer 70
- AstroView 80/90
- Explorer 80/90
- Takahashi Sky 9011
- Vixen ED80sf, ED100sf
The ST400G Full Aperture Glass Solar Filter with 101 mm inside diameter provides a safe way to directly view the sun. It allows the maximum amount of light possible to pass through to your telescope, using the entire aperture of your optical tube to enable the finest daylight viewing quality with limited atmospheric instability. When instability does occur, a mask can be placed over the filter for sufficient aperture reduction.
Felt padding and nylon thumb screws help fix this durable premium solar filter with centered aluminum cell to the end of the telescope. Superior quality, hand-selected glass with extensively inspected reflective coatings is used in the design of this filter. The sun has a natural yellowish-orange look under direct observation through a telescope with the ST400G Solar Filter.
In order to prevent this filter from acquiring damage while being shipped, it comes shielded in plastic in a box lined with foam. Furthermore, this box also provides a convenient method for storing the filter when it's not in use. Includes comprehensive instructions detailing proper use and care of your unit.
Spectrum ST400G Full Aperture Glass Solar Filter Specifications
- Inside Diameter: 4" (101 mm)
- Clear Aperture Diameter: 3.15" (80 mm)
- Fits instruments with an outside diameter range of 3.625" - 3.875" (92 mm - 98 mm)
In order to assure a proper fit, please be sure to measure the outside diameter of your telescope before committing to purchase a specific solar filter as telescope specifications may be modified with subsequent versions due to re-designs, etc.
What About Your Finderscope?
Adding this solar filter to your telescope will adequately filter the light coming through your focuser, but have you considered what you’ll do about your finder scope?
Here are some suggestions for dealing with your finder that will assure you do not damage your eyes (or anyone else’s) by looking at the Sun through your telescope’s unfiltered finder:
- Remove Your Finder. Ditching your finderscope when solar viewing will remove the possibility of someone accidentally looking through it to spot the Sun. Of course, not having a finder makes centering the Sun in your eyepiece more difficult, but with practice, it can be done. Set the mount down so the telescope is pointing in the direction of the Sun. Put the main solar filter on so you can check your progress, and then move the telescope around until it casts a shadow that produces a nice, sharp silhouette of the scope. The OTA will look circular. Now move your telescope up or down with your hand controller, slow motion controls, or very carefully by hand if required while looking through the eyepiece. You will not get a warning when you are close, but you should be able to align with the Sun using this method. Practice ahead of time before any big event, like an eclipse, to make sure you’ve got the process down.
- Filter Your Optical Finder. This solution is not recommended for a reflex or red dot finder since it is too easy to accidentally look around the window. If you have one of these finders we recommend you either remove it or replace it with a dedicated solar finder (see below).
To make your optical finderscope safe for solar viewing you’ll need to buy a piece of Baader Solar Film for Visual Use. This film comes in different size sheets and cuts easily with scissors, allowing you to make your own filter. You can go super low-tech and use a rubber band to hold a piece of the film firmly around the finder or you can get fancy and build your own slip-on solar filter. However you attach the solar film, you need to make sure there are no light leaks at all and that it doesn’t accidentally fall off when you move your telescope around. Any unused film can store flat between two pieces of cardboard and will keep for years. It is nice to have around, just in case of a solar emergency :-)
- Buy a Dedicated Solar Finder. Check out the Tele Vue Sol-Searcher Solar Finder. This special finder can only be used when observing the Sun, but it works very well. The Sol-Searcher is reasonably priced and can be attached to your telescope with Velcro or with #10-32 screws (user supplied).