Tag Archives :optical

The SV406P birdwatcher has a 20-60x zoom capability and an excellent clear field of view. It uses ultra-low dispersion glass and full multi-layer coating technology, allowing observers to easily identify distant birds and their subtle features. This lens significantly improves image clarity and light transmission, which is particularly important for professional researchers and photography enthusiasts, greatly enhancing the fun and experience of observation.  ...

Determining the correct back focus for your telescope can be a daunting task for both beginners and experienced astrophotographers. In this article, we’ll discuss why back focus distance is so important, all the factors you need to consider for back focus distance, and how to use adapters and spacers to get the perfect back focus distance.  ...