昨晚再到我們新界西基地測試ZWO Seestar S50 ，加上遮光罩及防露發熱帶，Antlia Triband RGB Ultra濾鏡可以發揮作用 https://eshop.astro.hk/hk/catalogs/products/addf858f-6782-4c57-b8a6-edd39b5abb04 在大氣透明度極低，只能勉強看到2等多的星情況下，NGC6992面紗星雲還是有一定表現力，但始終Seestar定位為EAA即電子輔助天文觀測器材，地平式台架對長時間曝光有一定限制，例如這張37分鐘曝光的照片看到四角出現訊噪比較低的斜角區域，就是場旋造成。下一批Seestar已經發貨，預計本週五台下週一可以交付給9月14日中午前下單的愛好者，有興趣的可以支付10%訂金預訂，https://eshop.astro.hk/hk/catalogs/products/0fdc1b1f-989e-4f8b-92e5-be7d10ef51d9

Last night we tested ZWO Seestar S50 again at our New Territories west base. With the light shield and dew heater on, the Antlia Triband RGB Ultra filter performed well  https://eshop.astro.hk/en/catalogs/products/addf858f-6782-4c57-b8a6-edd39b5abb04 . Despite the extremely low atmospheric transparency, where only stars of magnitude 2+ were barely visible, the NGC6992 Veil Nebula still showed some detail. However, it should be noted that the Seestar is primarily designed for Electronically Assisted Astronomy (EAA), and the Alt-Az mount has limitations for long-exposure imaging. For example, in this 37-minute exposure, areas of lower signal-to-noise ratio appeared in the corners was caused by field rotation. The next batch of Seestar units has already been shipped, and we expect to deliver them to enthusiasts who placed their orders before noon on September 14th by this coming Monday. Interested customers can pre-order with 10% deposit at https://eshop.astro.hk/en/catalogs/products/0fdc1b1f-989e-4f8b-92e5-be7d10ef51d9