Spectrum Telescope Glass Solar Filter: 3.5" Cell Inside Diameter
Stock count is accurate & shown in real time.
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available.
- This item is out of stock.
- We have no ETA from the manufacturer at this time.
- Sign up for back-in-stock alerts to be notified when this item becomes available.
Lower 48 States:
Orders over $50 ship free within the Lower 48 using a carrier and service we select based on your items and delivery location. Faster shipping options may be available at checkout.
U.S. Outside the Lower 48 (AK, HI, PR):
Free shipping on orders over $50 applies to many—but not all—items. Add items to your cart and enter your ZIP code to see available shipping options and any costs.
International Orders:
Free shipping does not apply to international orders. You’ll see available shipping options and costs during checkout. Some items can’t be shipped internationally due to size or manufacturer restrictions. Duties, taxes, brokerage fees, and tariffs are not included and are the customer’s responsibility.
ALL SALES FINAL. NO RETURNS OR EXCHANGES. PLEASE MEASURE YOUR TELESCOPE/LENS OUTSIDE DIAMETER VERY CAREFULLY AS EXPLAINED BELOW BEFORE ORDERING.
Spectrum Telescope glass solar filter mounted in a 3.5" inside diameter cell # ST350G.
1. Selecting the Correct Solar Filter for your Telescope
This solar filter is designed to be fitted on the front (sky-end) of your telescope, spotting scope, or camera lens. The filter slides over the front of the tube and is locked down in place with the included thumbscrew(s).
This filter cell has an inside diameter of approx. 3.5" and has a clear filter aperture of 2.85" (72mm). It is meant to fit on tubes with an outside diameter between 3-1/8" (79mm) to 3-3/8" (86mm).
This filter is known to fit the following items:
- Meade DS-80EC
- StellarVue NightHawk 80mm (with dew shield) and SV80s
- TeleVue Ranger, TeleVue Oracle 3
- Takahashi FC-50, FC-60, FC-60C
- Williams Optics ZS66, ZenithStar Racing; Zeiss Telementor Refractor
- Others? Let us know!
However, we very strongly recommend that you buy this filter only after measuring your tube size carefully (as explained below), even if your telescope is mentioned in the list above.
To get the proper fit, measure the outside diameter very carefully by using a caliper, ruler, or tape measure. See the 4th product photo above. Measure the widest distance of the telescope tube starting from the exterior of the casing, across the center and to the exterior part of the casing on the other side. After you have your measurements, you should order a size slightly larger than what you measured. This is because your measurement is being compared with the solar filter ID (inside diameter). For instance, if you measure 4" across the outside of the tube end, you should order a 4.25" inside diameter size solar filter. This will make it just a little bigger than the measurement you took.
Also, for example, If you have a 4" telescope, do not buy a 4" solar filter! Telescope aperture is not the same as telescope tube size. The telescope tube diameter will always be slightly larger than the telescope aperture. Measure it carefully before ordering to avoid disappointment and expensive returns.
2. Filter Substrate and Cell Details
This full aperture glass solar filter allows only a safe amount of light to pass through your telescope, spotting scope, etc. for solar viewing or imaging. It is an ND 5 filter and therefore blocks 99.999% of the Sun's visible light. It is made from hand-selected glass that is of high quality and coated with a thoroughly inspected reflective coating. The image of the sun viewed through this glass solar filter has a yellowish-orange natural look when directly viewed through a telescope or if photographed.
The glass filter is mounted in an aluminum cell that can be securely attached to the telescope tube with the included nylon thumb screw(s). This filter comes packaged in a foam-lined shipping/storage box. Instructions for storage and care are also included.
3. Warning
Never look at the sun without special eye protection. When viewing the Sun, use this filter in front of your optical instrument at all times when any part of the Sun is visible.
Other Information
- Country of Manufacture: United States
Spectrum Telescope glass solar filter mounted in a 3.5" inside diameter cell # ST350G.
1. Selecting the Correct Solar Filter for your Telescope
This solar filter is designed to be fitted on the front (sky-end) of your telescope, spotting scope, or camera lens. The filter slides over the front of the tube and is locked down in place with the included thumbscrew(s).
This filter cell has an inside diameter of approx. 3.5" and has a clear filter aperture of 2.85" (72mm). It is meant to fit on tubes with an outside diameter between 3-1/8" (79mm) to 3-3/8" (86mm).
This filter is known to fit the following items:
- Meade DS-80EC
- StellarVue NightHawk 80mm (with dew shield) and SV80s
- TeleVue Ranger, TeleVue Oracle 3
- Takahashi FC-50, FC-60, FC-60C
- Williams Optics ZS66, ZenithStar Racing; Zeiss Telementor Refractor
- Others? Let us know!
However, we very strongly recommend that you buy this filter only after measuring your tube size carefully (as explained below), even if your telescope is mentioned in the list above.
To get the proper fit, measure the outside diameter very carefully by using a caliper, ruler, or tape measure. See the 4th product photo above. Measure the widest distance of the telescope tube starting from the exterior of the casing, across the center and to the exterior part of the casing on the other side. After you have your measurements, you should order a size slightly larger than what you measured. This is because your measurement is being compared with the solar filter ID (inside diameter). For instance, if you measure 4" across the outside of the tube end, you should order a 4.25" inside diameter size solar filter. This will make it just a little bigger than the measurement you took.
Also, for example, If you have a 4" telescope, do not buy a 4" solar filter! Telescope aperture is not the same as telescope tube size. The telescope tube diameter will always be slightly larger than the telescope aperture. Measure it carefully before ordering to avoid disappointment and expensive returns.
2. Filter Substrate and Cell Details
This full aperture glass solar filter allows only a safe amount of light to pass through your telescope, spotting scope, etc. for solar viewing or imaging. It is an ND 5 filter and therefore blocks 99.999% of the Sun's visible light. It is made from hand-selected glass that is of high quality and coated with a thoroughly inspected reflective coating. The image of the sun viewed through this glass solar filter has a yellowish-orange natural look when directly viewed through a telescope or if photographed.
The glass filter is mounted in an aluminum cell that can be securely attached to the telescope tube with the included nylon thumb screw(s). This filter comes packaged in a foam-lined shipping/storage box. Instructions for storage and care are also included.
3. Warning
Never look at the sun without special eye protection. When viewing the Sun, use this filter in front of your optical instrument at all times when any part of the Sun is visible.
ALL SALES FINAL. NO RETURNS OR EXCHANGES. PLEASE MEASURE YOUR TELESCOPE/LENS OUTSIDE DIAMETER VERY CAREFULLY AS EXPLAINED BELOW BEFORE ORDERING.
Spectrum Telescope glass solar filter mounted in a 3.5" inside diameter cell # ST350G.
1. Selecting the Correct Solar Filter for your Telescope
This solar filter is designed to be fitted on the front (sky-end) of your telescope, spotting scope, or camera lens. The filter slides over the front of the tube and is locked down in place with the included thumbscrew(s).
This filter cell has an inside diameter of approx. 3.5" and has a clear filter aperture of 2.85" (72mm). It is meant to fit on tubes with an outside diameter between 3-1/8" (79mm) to 3-3/8" (86mm).
This filter is known to fit the following items:
- Meade DS-80EC
- StellarVue NightHawk 80mm (with dew shield) and SV80s
- TeleVue Ranger, TeleVue Oracle 3
- Takahashi FC-50, FC-60, FC-60C
- Williams Optics ZS66, ZenithStar Racing; Zeiss Telementor Refractor
- Others? Let us know!
However, we very strongly recommend that you buy this filter only after measuring your tube size carefully (as explained below), even if your telescope is mentioned in the list above.
To get the proper fit, measure the outside diameter very carefully by using a caliper, ruler, or tape measure. See the 4th product photo above. Measure the widest distance of the telescope tube starting from the exterior of the casing, across the center and to the exterior part of the casing on the other side. After you have your measurements, you should order a size slightly larger than what you measured. This is because your measurement is being compared with the solar filter ID (inside diameter). For instance, if you measure 4" across the outside of the tube end, you should order a 4.25" inside diameter size solar filter. This will make it just a little bigger than the measurement you took.
Also, for example, If you have a 4" telescope, do not buy a 4" solar filter! Telescope aperture is not the same as telescope tube size. The telescope tube diameter will always be slightly larger than the telescope aperture. Measure it carefully before ordering to avoid disappointment and expensive returns.
2. Filter Substrate and Cell Details
This full aperture glass solar filter allows only a safe amount of light to pass through your telescope, spotting scope, etc. for solar viewing or imaging. It is an ND 5 filter and therefore blocks 99.999% of the Sun's visible light. It is made from hand-selected glass that is of high quality and coated with a thoroughly inspected reflective coating. The image of the sun viewed through this glass solar filter has a yellowish-orange natural look when directly viewed through a telescope or if photographed.
The glass filter is mounted in an aluminum cell that can be securely attached to the telescope tube with the included nylon thumb screw(s). This filter comes packaged in a foam-lined shipping/storage box. Instructions for storage and care are also included.
3. Warning
Never look at the sun without special eye protection. When viewing the Sun, use this filter in front of your optical instrument at all times when any part of the Sun is visible.
Other Information
- Country of Manufacture: United States
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
Spectrum Telescope Glass Solar Filter: 3.5" Cell Inside Diameter