D40 is an achromatic objective lens designed for self-made refractor telescopes and provides clear and sharp images. With an actual diameter of 40 mm and a focal length of 205 mm, it is perfect for amateur astronomers and telescope enthusiasts. The coating with a blue adhesive film minimises chromatic aberration and thus allows a better viewing experience. Easy to install: follow the installation instructions and position the thin side of the lens towards the scene for optimal performance. This lens is ideal for DIY projects and telescope upgrades and is an essential accessory for anyone who wants to improve their astronomical observations.
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