Blocking Filters
The smallest recommended BF for a specific scope allows for the most inexpensive version of the assembly without cutting off the image at the image plain.
ie: The image size of the 60mm Lunt Solar Telescope is 4.2mm. The 6mm Blocking Filter provides almost 1mm of area around the Solar disk. A smaller Blocking Filter would cut off the image and would not allow for a full disk view. A smaller Blocking Filter would also cause significant uniformity issues at the edges.
A slightly larger (one size up) is always recommended whenever the user intends to do imaging, manual tracking, or requires a larger field of view for increased visual comfort and Solar edge contrast. One size up is the minimum recommended size. Depending on the size of your scope and the type of camera you may want to chose 2 step higher Blocking Filter.
The advantage of getting a larger Blocking Filter for imaging use now is that, a) it removes the need to upgrade later should you decide to image later, and b) it provides more wiggle room around the Blocking Filter in Visual mode. (There is more dark space around the Sun when viewing). This also has the advantage of not having to adjust the mount as often when tracking manually.
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Blocking FiltersLunt Blocking Filters – B600, B1200 & B1800
- A Blocking Filter is a required component when using any Lunt solar filter or solar telescope products.
- The housing contains additional filters that are needed for safety when viewing the Sun. Do not use a Lunt Solar Systems telescope or filter without a Lunt brand blocking filter.
- Available in three different aperture from this drop-down list. Choose the blocking filter that best suits your applications, focuser size, and telescope focal length.
- The 12 mm blocking filter is offered in a 1.25″ or 2″ diagonal housing, and the 6mm & 18mm are available in a 1.25″ diagonal, 2″ diagonal, or 2″ straight-through extension tube design. The large 34 mm blocking filter is available in a 2″ straight-through housing only, and can be purchased by clicking the link.
Please Note: If this product shows “Available on Backorder” and you would like to “get in line” by placing an order with a 10% deposit, send us an email. A member of our staff will contact you with lead times and deposit information.
Estimated lead time: 2 weeks
(0 reviews)$348.00 – $998.00 Select options -
Solar ProductsLunt B3400 Blocking Filter
- A Blocking Filter is a required component when using any Lunt solar filter or solar telescope products.
- The housing contains additional filters that are needed for safety when viewing the Sun. Do not use a Lunt Solar Systems telescope or filter without a Lunt brand blocking filter.
- The B3400 Blocking Filter is recommended for telescopes with focal lengths of 3400 mm when used visually, and 1800 mm when used for imaging applications.
- The 34 mm blocking filter is housed in a 2″ straight-through housing.
Please Note: If this product shows “Available on Backorder” and you would like to “get in line” by placing an order with a 10% deposit, send us an email. A member of our staff will contact you with lead times and deposit information.
Estimated lead time: 1 month
(0 reviews)$1,798.00 Add to cart
