To 1.6X extender Users 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 November 25th, 2004, 04:27 PM   #1
Major Player
 
Join Date: Aug 2003
Location: Vancouver
Posts: 351
To 1.6X extender Users

Hi guys,

I got this about a week ago, and have used it on 4-5 occasions. My maincomplaint with it is it seems to soften the image more than I would consider acceptable. I can also see the slight loss of light.

I'm just interested if this is comon to other users or do I have a lemon. I bought it on ebay, so I don't know I have a return ability.

thanks

DBK
__________________
Darren Kelly
Darren Kelly is offline   Reply With Quote
Old November 26th, 2004, 03:12 AM   #2
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
Could you post a frame from the video that looks too soft to your
eyes? I could imagine (don't know for sure) that you get some
light loss because the light has to travel to an additional optical
adaptor.
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old November 28th, 2004, 08:20 AM   #3
Major Player
 
Join Date: Jan 2004
Location: Singapore, Rep of SINGAPORE
Posts: 749
I don't see any problems using Canon XL1.6 teleconvertor on the 20X Canon lens. The image is sharp ... If you want to see a snap shot (one frame) - pass me your email id - and I will send one or two pictures from my Canon XL2 to you. It is PAL however.
TingSern Wong is offline   Reply With Quote
Old November 28th, 2004, 01:29 PM   #4
Major Player
 
Join Date: Jun 2004
Location: McLean, VA United States
Posts: 749
I've used lots of tele extenders over the years and it doesn't seem to matter whether they come from Nikon or Bud's Tele Extender Works, they all soften the picture appreciably. IOW, some degree of softening is to be expected. The question is really as to what degree is acceptable to you. I don't use them any more because we're not exactly long on resolution in SD video to begin with. If you want sharp telephoto buy one of the adapters and use lenses made for SLR's.
A. J. deLange is offline   Reply With Quote
Old November 28th, 2004, 02:43 PM   #5
Major Player
 
Join Date: Sep 2003
Location: Miami, FL
Posts: 574
Anytime you add glass, especially in the form of an extender, you will lose some resolution. The loss shouldn't be so noticeable that the picture becomes distracting or unusable. If your picture has degraded that much, there may be a problem with your particular unit.

Any extender will be good for a 1 1/2 to 2 stop loss in light transmission, that's why extenders are not too user friendly in low light.

RB
__________________
"The future ain't what it used to be." Yogi Berra.
www.rbravo.com
Rick Bravo is offline   Reply With Quote
Old November 28th, 2004, 03:12 PM   #6
Major Player
 
Join Date: Aug 2003
Location: Vancouver
Posts: 351
These are all things I am aware of when it comes to still photography, but never having a broadcast lens with a doubler on it, or using somethinglike this on a video camera, which has less resolution than a still picture, I was hopeful it wouldn't make as much of a difference.

On light...

I assumed the aperture would widen or open automatically to compensate

On Sharpness...

I didn't think it would be noticable on video due to the reduced resolution.
I've used both Sony and Century converters before infront of the lens with good success.

Am I making any sense?

DBK
__________________
Darren Kelly
Darren Kelly is offline   Reply With Quote
Old November 28th, 2004, 08:33 PM   #7
Major Player
 
Join Date: Jan 2004
Location: Singapore, Rep of SINGAPORE
Posts: 749
A simple thumb of rule is this -

1.5x - 1.6x teleconvertor will cause the prime lens aperature to be reduced by 1/fstop, while a 2X teleconvertor will push it to 2 stops less light.

Hence, using a lens of f/1.4 and putting a 1.6x teleconvertor in between - will reduce light reaching the CCD to f/2. Using a 2X teleconvertor will get that number down to f/2.8.

The lens aperature is fixed. It will not open any wider. The camera has to compensate for the reduced light, by using a slower shutter speed (assuming you are already using maximum opening for the lens).

As for reduced sharpness, it should not be that obvious - as I told you earlier. With or without teleconvertor, I can't see any degradation in the image recorded on my XL2 - using my 20X Canon lens.

What might cause your problem could be camera shake. 20X with a 1.6 teleconvertor multiplies the magnification to 32X - and unless you have a rock steady tripod placed on a rock steady platform, any shake will be magnified appropriately.

TS
TingSern Wong 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 04:34 PM.


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