What is a deep space filter?

I personally like filters very much! ! ! !

The answer is as follows:

First of all, deep space filters are divided into the following categories.

OIII, H-β filter, UHC filter, deep space filter, etc.

This is a good thing, but each filter has its own characteristics and uses it in different ways. As the landlord said, filters can greatly reduce light pollution, which plays a decisive role in the city. At the same time, the filter can better distinguish the details of celestial bodies, increase the contrast and make celestial bodies easier to see. Especially for planetary nebulae, diffuse nebulae, reflection nebulae, dark nebulae and supernova remnants, it is very useful.

But its price can be imagined, very expensive! Our classmate said that a set of filter screen costs about 5000 yuan ... it seems that we can only pay the bill.

I've heard of Sirius's filter and Lumicon's filter, but I don't know anything else.

Landlord, I added your number, so we can discuss it by SMS.

I really want to buy it, too ...