--- product_id: 33141344 title: "Baader Planetarium Dark Blue 435nm Bandpass Filter, 1.25\" Eyepieces" brand: "baader planetarium" price: "3.64 DT" currency: TND in_stock: false reviews_count: 1 url: https://www.desertcart.tn/products/33141344-baader-planetarium-dark-blue-435nm-bandpass-filter-1-25-eyepieces store_origin: TN region: Tunisia --- # 70% transmission efficiency 1.25" eyepiece fit 435nm bandpass Baader Planetarium Dark Blue 435nm Bandpass Filter, 1.25" Eyepieces **Brand:** baader planetarium **Price:** 3.64 DT **Availability:** ❌ Out of Stock ## Summary > 🔭 See the Universe in a New Light! ## Quick Answers - **What is this?** Baader Planetarium Dark Blue 435nm Bandpass Filter, 1.25" Eyepieces by baader planetarium - **How much does it cost?** 3.64 DT with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/33141344-baader-planetarium-dark-blue-435nm-bandpass-filter-1-25-eyepieces) ## Best For - baader planetarium enthusiasts ## Why This Product - Trusted baader planetarium brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision Engineering:** Crafted with substrates polished to within 30 seconds of arc for flawless clarity. - • **Astigmatism-Free Viewing:** Enjoy sharp, distortion-free images for an immersive stargazing experience. - • **Unleash Celestial Wonders:** Experience unparalleled lunar details and vibrant comet tails. - • **Elevate Your Astronomy Game:** Perfect for both amateur astronomers and seasoned stargazers alike. - • **Versatile Optical Integration:** Easily integrates into any optical path without compromising image quality. ## Overview The Baader Planetarium Dark Blue 435nm Bandpass Filter is engineered for 1.25" eyepieces, offering 70% transmission efficiency. Its precision-polished substrates ensure minimal distortion, making it ideal for observing lunar features, comet tails, and planetary details without introducing astigmatism. ## Description The Baader Planetarium Dark Blue 435 nm bandpass filter has a bandpass at 435 nm and is designed for 1.25" eyepieces. A fine optical polish and 2 mm thick glass allows this filter to be inserted anywhere into the optical path without introducing astigmatism or other defects. For instance, it can be used in front of a binocular viewer without degrading the image in any way. Substrates are free of striae and plane-parallel polished to within 30 seconds of arc. This eliminates any double images or ghosting due to wedge errors in the glass.The filter cell features the largest clear aperture of any telescope filter on the market for complete freedom from vignetting at any focal length. The front "crown" incorporates milled notches, which makes handling and threading the filter an easy operation in the dark. All surfaces are treated with a 7-layer Multi-Coating, featuring a mere 0.25% residual reflection. It is the most elaborate coating ever applied onto amateur color filters, resulting in a filter free of any false reflections under any incident angle of light.Light is the hottest commodity for all planetary observation. Especially during high magnification work, whether you have enough light or not is the deciding factor for the recognition of the subtlest planetary surface detail, much more important than a horde of different filters of mediocre execution. The 7-layer MC-coatings not only provides a brighter image, they prevent the softening effect of scattered ## Images ![Baader Planetarium Dark Blue 435nm Bandpass Filter, 1.25" Eyepieces - Image 1](https://m.media-amazon.com/images/I/61TZ+P9xzKL.jpg) ![Baader Planetarium Dark Blue 435nm Bandpass Filter, 1.25" Eyepieces - Image 2](https://m.media-amazon.com/images/I/71qOEfzq2CL.jpg) ![Baader Planetarium Dark Blue 435nm Bandpass Filter, 1.25" Eyepieces - Image 3](https://m.media-amazon.com/images/I/71mgYWMvFJL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Five Stars *by W***R on Reviewed in the United Kingdom on May 3, 2017* 1st class product. 1 wish the company produced a similar filter with cut off 390 nano --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/33141344-baader-planetarium-dark-blue-435nm-bandpass-filter-1-25-eyepieces](https://www.desertcart.tn/products/33141344-baader-planetarium-dark-blue-435nm-bandpass-filter-1-25-eyepieces) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-17*