I've had a dabble with welding glass and had some strange marks and weird colours and discovered it was light leaking through the eyepiece, solved it by fitting the eyepiece cover and bingo problem solved
Yep as said above looks like leaking light. Eye piece cover should sort it. Also try a make sure you've got a perfect seal where you've mounted you glass.
or right i new i had forgot something thanks ill try that next time
im not sure i like the effect although i think it need trying on a sea shot instead of local res