Note:Black can only watch the sunrise and sunset of the sun, not at night, and not only when the sun is strong, otherwise it may explode for more than 20 seconds. When the sun is strong, you must use the Budd film on the objective lens or the sun. Film viewing.Lens material: pure optical glassFrame material: aluminum alloySize: 1.25 inches (31.7mm)Thread: M28.6*0.6mmNet weight: 10gNote: M28 series thread is suitable for more than 90% of the 1.25-inch eyepieces in the market. If it is an eyepiece with M30 series thread, you can configure the adapter ring yourself, thank you Tip: How to identify M28 series or M30 series, directly buy a sample of this model and go back to test, the product cannot be rotated, and the thread is small, then it is basically determined that the eyepiece is M30 thread, and the eyepiece that supports the connection of the filter is currently on the market. There are only two thread specifications, M28.6*0.6mm and M30*1mm, which are industry standards. If it is the third type, it is special or does not support connecting filters.Q&AQ1: Can M28.5*0.6mm thread be used? A: Yes, it is the same Q2: Can M28.5*0.75mm thread be used? Answer: Basically yes, but it cannot be fully rotated. It can be rotated for 1 turn without affecting the use. This specification is produced by those unprofessional factories.Q3: Can M28*0.6mm thread be used? A: It needs to be tested. If it is a product of our company, it is the same In the early days of the M28 series, we marked it with M28*0.6mm for the abbreviation. If it is from another company, the situation is not clear, and the customer needs to test it by himself.Q4: Can M30*1mm thread be used? A: No, there are relevant introductions above, please read them carefully 1 filter1 plastic storage box