Answer: PRISMATIC PERISCOPE
There are seven answers of seven letters each. The answers start with letters ROYGBIV, which we use as an ordering on the answers. Furthermore, each answer is from a puzzle whose telescope (in the round art) has some color bands. Those colors are then used as indices into the answer.
ROYGBIV Time is out of Joint REPRISE YGB PRI Nina OSMOSIS OY SM Wizardly Tales YAHTZEE OG AT Captain Ager's Puzzling Adventure GRAPHIC IV IC This Puzzle Has No Errata BLOOPER BIV PER Montages ITSCOOL RYGB ISCO Wait, What Did You Say? VAMPIRE GV PEThese letters spell the answer, PRISMATIC PERISCOPE.