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03/30/2003 04:13:22 AM · #1 |
I am planning to experiment more with filters, only I've read somewhere that emitters on Sony 707 and 717 cause problems (glare, etc.) even with a simple UV or ND filter. Is it true? Are there any tips and tricks to reduce these problems?
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03/30/2003 08:01:26 AM · #2 |
Hi Galina.
It is true that in certain situations, there is glare reflected back from the inside of a filter on the F-7X7. I use a UV filter permanently, in order to protect my lense. The situations I've found this to be a problem are when you use Nightshot or Nightframing modes (IR modes). With a UV filter attached, the IR light bounces off the filter, back to the front of the lense and back again, creating an interesting effect (best way I can describe it is like a road narrowing and dissapearing in the distance - made up of ciruclar dots). Try it sometime to see what I mean. The photos still turn out, but you have that reflecting effect in the final output.
Unfortunately this is not great for photographic results. In the very rare circumstances where I'm doing photography using Nightshot mode, I tend to take off the UV filter to get the shot I want then put it straight back on. Nightframing is fine, because it only uses IR to frame your shot then turns it off before actually taking the photo.
I have not found a problem with reflections when using the low-light laser focusing beam. These are the only two "transmitted" beams from the front of the camera, despite there being 3 positions it transmits from. 1 is the laser beam for focussing, the other two are IR emitters.
I dont know of any tips/tricks to avoid the IR problem, other than removing whatever filter you are using at the time.
Hope that helps! If you come up with any tips yourself, please let us know!
Andrew |
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03/30/2003 09:32:54 AM · #3 |
Andrew is right on.
The reason, of course, is that all the emitters are mounted right beside the lens inside the filter, therfore if it is on during the shot you will get a reflection.
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03/30/2003 02:35:31 PM · #4 |
I agree with the previous posters. One other point that I would mention is that the 'narrowing road' effect Andrew mentions varies with focal length. It's more noticeable at the wide end of the lens than when fully zoomed. In fact, I can't see it at all when at the extreme telephoto end of the lens.
I have heard of folks into daytime IR photography (with an IR filter) making a cardboard 'donut' to slip behind the filter and mask off the output from the IR emitters. Haven't tried it myself though.
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03/30/2003 02:47:39 PM · #5 |
Thank you, guys. Very helpful. Just one more question - is that 'narrowing road' effect visible with UV/polarizing filter in daylight, rather than at night?
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03/30/2003 02:57:37 PM · #6 |
Well, daylight is generally too bright to use Nightshot without an IR filter. From what I've heard from folks with IR filters, they've masked off the output from the IR emitters as I described, so I would imagine it would.
I always have a UV filter on, except if it causes me problems in the dark with Nightshot, when I take it off. But to be honest, I tend to use Nightframing more than Nightshot anyway.
You won't get the narrowing road effect unless the IR emitters are on, and they're only on in Nightshot/Nightframing modes.
I haven't noticed any problems with a UV filter and the Laser focussing assist. (Although you should remember to turn the laser off if photographing people at events like school concerts - it can be quite embarrassing if your camera suddenly throws a laser grid over people on stage :-)
Message edited by author 2003-03-30 15:00:11.
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03/30/2003 03:42:43 PM · #7 |
Originally posted by pinback:
I have heard of folks into daytime IR photography (with an IR filter) making a cardboard 'donut' to slip behind the filter and mask off the output from the IR emitters. Haven't tried it myself though. |
That idea of a cardboard 'donut' is interesting! I hadn't thought of that. Will have to try it out sometime! Thanks Pinback!
Andrew |
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03/30/2003 03:59:00 PM · #8 |
Originally posted by Galina:
I am planning to experiment more with filters, only I've read somewhere that emitters on Sony 707 and 717 cause problems (glare, etc.) even with a simple UV or ND filter. Is it true? Are there any tips and tricks to reduce these problems? |
The autofocus assist emmitters are NOT a problem with filters. These go OFF before the shutter opens.
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03/30/2003 11:03:44 PM · #9 |
Second thoughts on this issue....
The AF assist system on the 7x7 could introduce some interesting exposure problems IF your filter is dirty. When you press the button half way to precompose your focus and exposure, I would assume that any glare caused by the emmitters on the surface of the filter could cause some confusion in the camera's metering system.
If in doubt, make sure your filters are clean or turn off the AF assist system in the menu of the camera...
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03/30/2003 11:37:24 PM · #10 |
Originally posted by jmsetzler:
The AF assist system on the 7x7 could introduce some interesting exposure problems IF your filter is dirty. |
Good point! |
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