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This topic comprises 3 pages: 1 2 3
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Author
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Topic: Bad Focus
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Jack Ondracek
Film God
![](http://www.film-tech.com/ubbmembers/1466.jpg)
Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002
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posted 01-17-2004 10:42 PM
quote: umm...what real harm can be done anyways?
Only that the suggestions above, while all good and valid when applied to a specific problem, are all over the place at present and are pretty much reacting to assumptions. You assume the lens is relatively new, but you don't know if it was working the day before this thread started. Therefore, the suggested fixes cover just about everything from initial alignment (which shouldn't need frequent repeating), to checking for loose elements (a good idea, but not what you might expect from a relatively new lens). Maybe the thing kissed a concrete floor from 5 or 6 feet, and then none of this matters. We just don't know yet.
This board is full of these situations, where someone asks about sticking a screwdriver into something, only to be bombarded by well-intentioned suggestions, some overly technical and probably not recommended if the problem hasn't been identified first. Eventually, someone even thinks about asking if the poster has the experience, and maybe the authorization to be taking the screwdriver out of the tool box in the first place. So there's the reason for my caution, maybe even curiosity. You wouldn't want to go and twist the volume pots on your amplifiers because you sense a balance problem, only to find that the real culprit is something out of whack in your processor, yet this kind of thing happens all the time and you wind up with a bigger problem than what you started with.
Again, with all due respect, if one of my people called to tell me the scope lens wouldn't focus, my suggestion that they start twisting the adjustments would most likely not be part of that phone call. But then, I would have gone into the call knowing what I had, how long it had been there, and the fact that those lenses had worked just fine up until some time very near when the call came in... all elements of the troubleshooting process that have not been established in this particular situation. Initially, given I'm not blessed with knob-tweakers, finding out that some staff member had decided to realign the lens while I had my back turned would not be high on my list of first expectations.
It's not necessarily wise to suggest changing the whole tire if it only needs a little air.
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