Btw, i'd recommend leaving the hood on. It increases the image quality greatly.
Unless you want to store the lens in its original case, it is very unhandy to mount and unmount that hood.
If the hood has been screwed on too tight you may uncsrew the plastic decorative ring on front element showing the lens name, nr and specifications. Under it there is another, metallic, ring securing the front element.
The hood itself can detach from the double sided screw ring aswell.
Wont the lens condensate heavily when removing from fridge?
The lens has fair resolution. Jupiter and moons with Jupiter-37A and k200d somewhere around f/5.6..f/4: