Different makes of tape? - Page 2 at DVinfo.net
DV Info Net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders

Canon XL and GL Series DV Camcorders
Canon XL2 / XL1S / XL1 and GL2 / XM2 / GL1 / XM1.

Reply
 
Thread Tools Search this Thread
Old June 15th, 2013, 06:56 AM   #16
Major Player
 
Join Date: Mar 2011
Location: London, UK
Posts: 353
Re: Different makes of tape?

Quote:
Originally Posted by Sherman Bahr View Post
Someone once told me that the higher the grade of tape the less that it wants to rearrange itself after it's been written to. This was told to me back in the VHS days. My assumptions are that the mini DV tape has extremely fine metal particles. Again the finer the particles and the higher the concentration the less that they want to rearrange because they're adhering the magnetic information so tightly. In practice I'm not so sure how true this is.

The one thing that I do know and have experienced is that rewriting over recorded information will cause more tape dropouts. Today's camcorders do a very good job at tape dropout compensation. But obviously there are times where the dropout is too severe to be covered up and that's when you see it.....
'Normal' tapes from reputable manufacturers have the same magnetic material compositions as 'professional' products. Most of the difference is the quality of the case and as has been said, the medium's freedom from stretches and uneven coating, as would be experienced from the edge of the manufactured roll. Once the product is packaged, the situation is different for each tape transport. A really bad one will cause coating shedding at a faster rate than a well set up one with little wear. Assuming that we aren't talking about the continued use of faulty mechanisms, even a well used drive will probably give little trouble with tens of tape passes. It's irrelevant how many times the passes involve erasure and re-recording, the mechanical stress is the same and the magnetic properties do not diminish with changes of their state. If that was the case, hard drives would be useless after a few hours use as the materials have similar magnetic durability.
As far as magnetic pattern retention is concerned, digital tape has little of the problems that we lived with in analogue tape use. The tape does not need to have linear magnetic properties, so it is designed for maximum coercitivity and only the field at the erase and record heads will move any underlying patterns. Of course, if the heads are faulty or worn out, they won't perform properly but we are considering equipment that is functioning within its normal parameters.
A tape will shed much more coating on its first pass than on the succeeding passes until it is nearing the end of its life. That life should be many passes downstream even for consumer tapes, whether they are still being used to play the first recording made on them or the last of a succession of writes.
Steve Game is offline   Reply With Quote
Old June 17th, 2013, 05:47 AM   #17
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,487
Re: Different makes of tape?

Pro tape is also likely subject to a higher quality control standard.

Quality magnetic tape is reliable and generaly has a long life if not subjected to environmental abuse. I have VHS tape that was recorded in 1979 that still plays, as well audio tape from the 1960s. The problem may be finding a player for that rare recording.

In the 1990 there were several serious magazine reviews of tape, including its multi-pass properties. E.g., signal properties after 100 playings. Losses generally were small.

However, sitting on pause will eat tape. That is why most camcorders had a time out - to reduce head and tape wear.
__________________
dpalomaki@dspalomaki.com
Don Palomaki is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

B&H Photo Video
(866) 521-7381
New York, NY USA

Scan Computers Int. Ltd.
+44 0871-472-4747
Bolton, Lancashire UK


DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



All times are GMT -6. The time now is 03:33 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network