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Old 12-07-2010, 15:56   #1 (permalink)
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Tv mode_shutter priority

I use shutter Tv mode alot now on my IR camera most of the time and like the results. When using color camera's in Tv I noticed that the aperture moved more dramatically to compose exposure then using Av mode and watching the shutter speed. My question, is it better to use Tv mode for special lighting and use Av when the lighting dosen't change as much?
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Old 12-07-2010, 20:31   #2 (permalink)
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Re: Tv mode_shutter priority

I never thought of it like that. I just use whichever setting seems right for the occasion which is invariably manual.
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Old 12-07-2010, 20:49   #3 (permalink)
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Re: Tv mode_shutter priority

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Originally Posted by Boofers View Post
I use shutter Tv mode alot now on my IR camera most of the time and like the results.
Interesting, I have only had my Camera recently converted to IR and I am still getting a feel for it. What I have found so far is:-

a. Even the most extreme outdoor scene (needing HDR for a straight colour Camera) seems to fit into the range for IR.
b. Using auto exposure (I have mainly been using AV when not in manual), I find that I need to add a 1.5 stop bias (increase in exposure).
c. If there is no direct sunlight few of the images are very interesting.

I had not considered using shutter priority as the subject matter has been all landscapes so far; I have used a tripod some of the time but it has not been necessary. If you have found subjects other than landscapes, I would be interested, though I will explore many subjects over the next 6 months.
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Old 12-07-2010, 23:33   #4 (permalink)
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Re: Tv mode_shutter priority

I've never found any particular difference between how TV reacts vs AV and am forever changing between the two according to whether I want a specific DOF or specific shutter - and then alter the exposure compensation as a 'best guess' in rapidly changing light. Can't actually remember when I last used manual - in the studio I think when I could ensure total control of lighting

For my IR or IR + visible light shots, I've usually got an M42 lens stuck on the camera and whilst the metering's accurate, I obviously have to manually set the lens, so tend to use AV on the camera. As always happens on these occasions, talk of IR has me reaching for the camera to get it set up - and of course we're now going into a cloudy/rainy patch! Typical!
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Old 13-07-2010, 03:19   #5 (permalink)
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Re: Tv mode_shutter priority

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Originally Posted by stepheno View Post
I never thought of it like that. I just use whichever setting seems right for the occasion which is invariably manual.
I noticed on my new camera that the aperture had changed from f/9 to f/22 shooting at 1/125 ISO100 the same spot consecutively. Never changed with that range 20D or 50D. I have played it down to using partial over evaluative metering.

[QUOTE=Dave Canon;308145]Interesting, I have only had my Camera recently converted to IR and I am still getting a feel for it. What I have found so far is:-

a. Even the most extreme outdoor scene (needing HDR for a straight colour Camera) seems to fit into the range for IR.
b. Using auto exposure (I have mainly been using AV when not in manual), I find that I need to add a 1.5 stop bias (increase in exposure).
c. If there is no direct sunlight few of the images are very interesting.

I envy having the 20D for IR, I use an XTi/400D. I always have a color camera with me and you use a button + dial to change compensation on 400D so Tv mode seemed easier. Using partial metering and I started to get evenly exposed pictures while holding the other camera. I like metal, tree trunks and buildings that are none reflective, trying to mix in some foliage. When riding my bike I take the XTi and 20D both with a 50mm f/1.8, open from raw both at 11.2 megapixels and PS lines them up with a script. Makes fun processing and interesting pictures.



[QUOTE=Markulous;308157]I've never found any particular difference between how TV reacts vs AV and am forever changing between the two according to whether I want a specific DOF or specific shutter - and then alter the exposure compensation as a 'best guess' in rapidly changing light. Can't actually remember when I last used manual - in the studio I think when I could ensure total control of lighting

A very natural view to take, I may be forming bad habits but? I shoot a lot in low evening light with shadows and like to force aperture to kick in ISO expansion. It seems to work with the better performing ISO cameras and I retain some higher speed shutter. As I mentioned to stepheno, the f/9 picture was lighter, the f/22 was darker, so I'm now thinking I should have used evaluative metering in this instance to balance the light. I have grown very found of partial metering and now think I have talked my self into a book. I love cameras.
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Old 13-07-2010, 11:48   #6 (permalink)
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Re: Tv mode_shutter priority

I think it is inevitable that we at least start using a new Camera (converted IR) as we have our standard cameras. I never use evaluative metering anyway but partial spot which is why I often meter a specific area then set the values in manual. However, there seems to be a diiference of 1.5 stops on my 20D IR between the correct value and what it reads, I do know that other IR photographers have had to make similar compensations so I have set the compensation permanently to +1.5. I have never set ISO to auto though I am not suggesting that one should not.

Looking at my earliest results so far, I feel the false colour versions of the IR images are usually better than the mono versions but I have yet to test any of my IR photographs in a competition.
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Old 13-07-2010, 13:19   #7 (permalink)
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Re: Tv mode_shutter priority

Manual is good. A note from my past shooting. I started with white balance, expo disc 90 degrees from sun or at brightest light source. It seemed to make pictures in the middle, not to bright, not to dark. Taking a new custom shot as the day went along. I stopped doing that leaving one custom setting and using compensation adjustments. IR light is reflective and that makes it change the way the camera meters so easily, light bouncing back and around that we don't really see. I am thinking about going back to my older method of taking white blance readings like morning, late morning, noon, evening, late evening and sunsetting time. I have captured sun rays several times with the sun off the edge of the horizon. I could take forever talking about how much fun IR has been as I never go anywhere with out my IR camera. I might change color camera's but always take my IR. Keeping the custom white balance has made ACR default settings a breeze as I like to have monochrome conversions from it and only some contrast adjusting.
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Old 13-07-2010, 18:12   #8 (permalink)
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Re: Tv mode_shutter priority

I am thinking that my original question got rolled over,,,"is there a time when Av is better to use then Tv concerning light sources". any input or ideas welcome from out there, like what is your preference ?
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