Hi, I've got a 76/700 newtonian telescope. The problem is that I see double images. When I try to focus, the two images get closer and closer to each other, and when they are very close, each of them are sharp, but when focusing further, they become one, but the image is blurry. There is a strange thing tho, that when seeing two very close sharp images for example of Saturn, then if I cover half of the front opening of the telescope by my hand, one of the images disappear, and I'm left with the other, sharp image. Same problem with the stars, when they seem sharp, all of them are doubled. I collimated the telescope with a pinhole cap (I'm gonna use a laser collimator soon to double check it). I'm using good quality coated plossl eyepieces with different focus lengths. All of them act the same way, so I'm assuming the problem is with the telescope optics. The primary mirror is not chipped or anything, the secondary seems to be silvered on it's surface so that seems fine too.
So can this be an issue still with collimation?