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Posted by Richard Crowley on 10/05/66 11:45
"Steve King" wrote ...
> "Richard Crowley" wrote ...
>> "Richard Crowley" wrote ...
>>> You can get the same artifacts from DVCAM. I am taking my DSR-300
>>> into the shop (today, I hope) to get a very similar problem fixed.
>>> It is likely a dirty and/or misaligned tape path.
>>
>> Problem turns out to be a moving guide that came loose
>> and dropped out of the tape path. Fortunately, nothing broke
>> and the missing part fell into the bottom of the case, etc.
>> It will cost me ~$250 (mostly for complete re-alignment
>> of the tape path, etc.)
>
> It could be worse, I suppose. How severe was the dropout problems
> without the guide?
There were 4-8 pixel squares of "pixelization" scattered
throughout the frame (about 1-2 per minute). But the main
artifact was constant and significant pixelization of the
whole right side of the frame. But only when the image
was moving. When that part of the frame was stationary,
it looked almost normal (because it was averaging whatever
data it could over a long-term).
The cause was that the tape did not get a complete wrap
around the head drum, so the bottom of the tape (=right
side of the frame image) was only partially writing data.
> I even hesitate to use the term dropout, which I have always thought
> of as an imperfection in the tape.
A dropout can be caused by several things other than
the tape.
> A producer friend of mine told me today that he had an occurance
> similar to mine, except it happened undetected during a shoot. Kids.
> Only one good take. The one with the dropout. He said he has
> switched to Sony's Excellence tape.
To be honest, I have not detected any difference between
"low-end" and "premium" tape. Ones are ones and zeroes
are zeroes. I'm sure I would see a difference if I were to
re-use tapes or use them in some other severe manner.
OTOH, I use Sony DVCAM tape almost exclusively, and
virgin, one-pass, at that. When we looked at the transport,
the repair engineer remarked at how clean it was, especially
for the number of hours on it.
> What's the thinking on DVM60PRL, the low end tape vs. DVM60EXL, the
> 'Excellence' brand at more than twice the cost? Of course, cost
> differences at current prices are really insignificant if there are
> real advantages to the top-of-the-line save the HD tape, which also is
> worth considering if there are real benefits. I'll be interested to
> hear opinions.
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