|
|||||||||
|
Thread Tools | Search this Thread |
November 6th, 2007, 05:59 AM | #1 |
Major Player
Join Date: May 2007
Location: Lielvārde, Latvia
Posts: 326
|
Lens reflection in filter problem
Hi,
I always use a UV filter on my XHA1 so that the lens is protected from dust and other environmental factors, but sometimes, when I shoot straight at a spotlight or sun, I get a reflection of the lens in the filter and so that reflection is filmed on tape and I get an end picture with visible camera lens. Is it because of a cheap filter or it's just something to avoid and a question of right technique? Thanks
__________________
Our Fire Films - a free film project. |
November 6th, 2007, 06:07 AM | #2 |
Major Player
Join Date: Jul 2007
Location: Gainesville, VA, USA
Posts: 327
|
Andris,
I've used UV filters on the A1 and done what you say but not seen the camera lens' reflecting on the filter. :) What was the aperture setting at that time? Typically, when you shoot towards the sun or other bright light, you'll see all the dust on the UV filter and lens, as a result, I tend to take off the UV filter for such shoots and clean lens really well too.
__________________
Canon XH-A1, Libec LS-55M, Letus Extreme, Steadicam Merlin, PPro CS3 |
November 6th, 2007, 06:14 AM | #3 |
Major Player
Join Date: May 2007
Location: Lielvārde, Latvia
Posts: 326
|
I had iris fully opened at about 1.2, shutter speed was at 24 frames, gain was +0, sometimes +6 (was shooting a live concert in a darkish club) and I use a HOYA UV filter.
Thanks for your suggestions, I gathered as much myself, but am curious if maybe there are simply better, more suitable filters.
__________________
Our Fire Films - a free film project. |
November 6th, 2007, 09:26 AM | #4 |
Major Player
Join Date: Jan 2007
Location: Warwick, Rhode Island
Posts: 740
|
it may be the uv protector. I have the same issue, using a basic tiffen protector that I got free with the camera...so its probably bottom of the line :\
__________________
Cinematography Site |
November 6th, 2007, 12:08 PM | #5 |
Regular Crew
Join Date: Sep 2007
Location: Poland
Posts: 141
|
These are differences between coating of UV Filters - but you will have this problem on Wide angle even with best filters. To eliminate this you need a French Flag or bigger Matte Box. Something like this:
http://picasaweb.google.pl/ivamosmeister/HardCase |
November 6th, 2007, 12:33 PM | #6 |
Major Player
Join Date: May 2007
Location: Lielvārde, Latvia
Posts: 326
|
Thanks.
But what brand UV filters do you suggest for non-wide angle?
__________________
Our Fire Films - a free film project. |
November 6th, 2007, 12:50 PM | #7 |
Regular Crew
Join Date: Sep 2007
Location: Poland
Posts: 141
|
I am using UV only to protect my lenses. It will be not a good idea to buy expensive filters for this an have need to protect the filters. These are no noticeable differences in Camerapicture for me - electronic devices can`t make use from UV protection. Due to this i use cheap Hama or Hoya UV Filters.
|
November 6th, 2007, 12:55 PM | #8 |
Major Player
Join Date: May 2007
Location: Lielvārde, Latvia
Posts: 326
|
I'm using them for the same purpose, but I'd like ones with a less reflective surface.
__________________
Our Fire Films - a free film project. |
December 27th, 2007, 12:45 PM | #9 | |
Sponsor: Schneider Optics
Join Date: Aug 2007
Location: Van Nuys, CA
Posts: 387
|
Quote:
Ryan Avery Schneider Optics |
|
December 27th, 2007, 04:47 PM | #10 |
Major Player
Join Date: Nov 2005
Posts: 477
|
I use a B&W UV filter and have never had any problems with reflections, etc with it. Go with quality, you won't be disappointed. The A1 is a beautiful $3500 +/- $$$ cam, I personally do not see why a "cheap" filter would be desireable. To save maybe $25 to $35??? Don't handicap that nice "L" series lens.
With respect to removing reflection from frames already shot, you may be able to load the offending clip into Photoshop and remove it, then send it back nto your NLE. |
December 27th, 2007, 04:51 PM | #11 |
Inner Circle
Join Date: Sep 2006
Location: Sydney.
Posts: 2,919
|
I agree Ryan, a long time ago I found that out the hard way.
Unfortunately when you buy an expensive camera like the A1, there's a tendency to baulk at having to spend more on quality accessories like filters and mics. But the weakest link in the chain will let you down, then you waste time, money and good video catching up. Cheers. |
December 27th, 2007, 09:38 PM | #12 | |
Trustee
Join Date: Jun 2004
Location: Denver, Colorado
Posts: 1,891
|
Quote:
|
|
December 28th, 2007, 02:02 AM | #13 |
Major Player
Join Date: Dec 2006
Location: Los Angeles, CA
Posts: 959
|
go with multi-coated filters & you shouldn't have those reflection issues... or at least much minimized.
Bill |
December 31st, 2007, 08:56 AM | #14 |
Wrangler
Join Date: Sep 2001
Location: Northern VA
Posts: 4,487
|
All lenses, even multi-coated, have reflections, just that quality multi-coated lenses have a significantly lower level of reflections. Uncoated lens surfaces reflect about 4% of the light, single-coated lens surface about 1-2%, and multi-coated even better at on the order of 0.5%
In most shooting situations involving average scenes, the reflections go unnoticed, even from low cost lenses, because the scene is brighter than the reflection and scene complexity masks what reflection might other wise be visible. However, if the scene contains large dark areas, the reflections may become apparent. Also, they may be more apparent if the lens (not just the CCD) can see very bright point sources of light. Use filters when they improve the image, provide an image effect you are seeking, or provide protection from unacceptable environmental risks. Avoid using filters when there is no clear benefit. UV is most likely to be an issue during outdoor daylight shooting, especially at high altitudes. Not likely to be an issue for most indoor shooting. And practice with the filters you plan to use under various lighting conditions to determine that artifacts they produce, and when they become objectionable.
__________________
dpalomaki@dspalomaki.com |
January 6th, 2008, 11:30 AM | #15 |
Regular Crew
Join Date: Jul 2007
Location: Cph Denmark
Posts: 136
|
The hoya UV-Filter effectivly removes that lens reflection effect. I had the same issue in the past, when shooting towards the sun... Now thats all history. I would even give Hoya so much credit that you can almost ditch the mattebox. "almost"
|
| ||||||
|
|