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Old 01-05-2017, 02:15 PM
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Dave A Dave A is offline
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Join Date: Aug 2003
Location: SE Pennsylvania
Posts: 1,266
It could be what is known as back focus where the tube in this case has moved somehow in its mount away from the focus point at the back of the lens. If the lens is removable you could try another lens otherwise you would have to crack the case open and see if the tube is able to slide in its yoke. Usually a screw clamp somewhere to hold it in place. Lots of voltage around the tube so do so carefully.
“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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