![]() |
Quote:
I have been told by people who really know lenses that this should not be happening with a lens of this caliber. Only $$$$ lenses are calibrated to hold aperture through the range. So all I can comment on is how mine behaves and I am glad I bought it. It may not be holding the exact aperture internally but the bottom line is the apparent light availablity does not seem to be diminsihed at all at full telephoto. FWIW. |
Quote:
|
Quote:
|
Kewl - sounds like one of several good reasons to opt for that lens. I'm kind of old-fashioned and for stills I like the control one gets with a film camera with manual controls and a hand held light meter. <gasp!> For stills I even prefer fixed focal length lenses - after close to 40 years of serious still photography it was only last year the I acquired my very first zoom lens to fit my 25 year old Nikon F2.
|
When on a tripod, the 16X manual is incredible. The ONLY downside to the lens is the lack of OIS...
ash =o) |
I have same issue too!
I also have the same issue with setting my focus, zoom in to set the focus, pan out and it loses it, this is very annoying!
After reading that there is more than one person annoyed with this I will be sending it back to canon. |
Matthew, I can confirm that both my XL2s, when used with their stock lenses (20x) do not lose focus between both extremes of the zooming range, regardless of the aperture change. You'll see a change in DOF of course, but the focal point should remain sharp. If it doesn't there's a strong possibility there's a back-focus issue.
If you do send it back, it would probably be wise to ask Canon before if you need to send the camera too. Sometimes the problem can be with the lens, other times it can be the camera (or even both). At least that's what I heard, never had such a problem myself. |
Quote:
For what it is worth, I have the 16x manual lens and it can be backfocus adjusted by the end user via a small flange at the back of the lens. On my XL2 I have the backfocus tweaked. When I put it on a different XL2 I had to adjust for that one. In turn, when put back on mine I had to readjust again. This shows that there can be minor differences between 2 cameras and maybe between all cameras. The auto lens is supposed to compensate automatically but there are times that it will need adjusted. FWIW.... |
I love the DOP I get from the 20x stock lens, but am considering the manual lens mainly because I can't stand it when I can't through or pull focus at the same time as zooming in or out. Is this a normal thing for an auto lens?
|
Yes...but the 20X you can set it up to do that for you... many people dont use this feature but it does work very well with practice. You can zoom manually and use a focus preset... or do a zoom preset... or do both...
ash =o) |
Quote:
I will check it out this morning. I use my 16x manual lens almost exclusively so I am not as familiar with the 20x as Ash and many other on this board. |
yes Marty, that's exactly what happens, bit of a pain to work with when you want to focus somewhere else during a zoom.
thanks Ash, it's ok to use the preset feature when you've got the time but not a run and gun scenario which is my field. I find the presets a bit fiddly anyway actually, because if you are at the tele end and even touch the lens, never mind flick the switch to activate the preset, you're going to get unsatisfactory shake - maybe if it was included in a Lanc controller(is it?) cheers. |
Focus may be controlled remotely via LANC, but not the focus position preset function.
|
yeah I've got a VZ Rock but seldom use the focus control, only the zoom and record really. still wouldn't help me though if I did use it to focus. I'd like to be able to pan/tilt and zoom with the VZ, and sometimes change focus on the lens barrel simultaneously...I'll have to get the manual lens won't I? Is it also controllable via Lanc?
|
The manual lens does not have a focus motor, therefore focus cannot be controlled remotely via LANC (although zoom is remotely controllable on that lens).
|
All times are GMT -6. The time now is 11:06 AM. |
DV Info Net -- Real Names, Real People, Real Info!
1998-2025 The Digital Video Information Network