The D-ERF filters are plane-parallel circular disks, both surfaces are precision optically polished, an infrared-reflective coating (layered system with many individual layers) prevents the penetration of heat into the telescope tube. The blocking of IR (heat radiation) holds the D-ERF filter plane-parallel even with longer observation times.
Only the best quality raw glass is used in the production of these filters, this ensures that the final product is able to cope with the stresses of solar use, whilst ensuring fantastic images and crystal clear observing. Above all, the D-ERF filter protects the expensive H-alpha filter, whilst in focus, against premature aging caused by heat stress.
Baader Planetarium filters are coated using ion-beam systems to keep the heat load on the glass as low as possible and still ensure an extremely hard, scratch-resistant coating.
Never use any eyepiece filter for solar observation without objective front filter.
At The Widescreen Centre, we prioritize prompt order processing and dispatch. We strive to dispatch all orders on the same day or the next working day, depending on the time of your order. We hold extensive stocks to ensure that your items are ready for immediate despatch. Please note that the cut-off time for same-day dispatch is usually 1:30 p.m.
For delivery within Mainland UK, we use reputable couriers to provide efficient service. You can expect your package to arrive in 1-2 working days. Please note that a signature may be required upon delivery to ensure a secure receipt.
In the case of special order items, the delivery time may be longer. If you have any concerns or questions about the delivery of your item, please don't hesitate to Contact Us. We are here to assist you.
Should there be any delay in dispatching your order, we will notify you to keep you informed.
Please be aware that The Widescreen Centre cannot be held responsible for any postal or third-party delays that may occur. We are committed to providing a reliable and efficient delivery service for our valued customers.
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