Author Topic: Questions and Answers on IR  (Read 85231 times)

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Offline Rob aka [minolta mad]

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Questions and Answers on IR
« on: April 03, 2008, 10:00:43 PM »
If anyone has any questions that they would like answering about anything to do with Infrared then Post them in this thread and then either myself or one of the growing number of IR enthusiasts this site has will answer them.

If you have any tips for taking photographs in Infrared then post them in the A Guide To Infrared Photography



Rob

Offline Dr.Theo

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Re: Questions and Answers on IR
« Reply #1 on: April 20, 2008, 07:37:25 PM »
Rob, have you every tried taking any ultra wide Ir shots with say a 10-20 or 17-35?
The first step is admitting you have a problem.
A700/7d/A100 sony 50/1.4|70-200 ssm|70-300G|CZ 16-80|Min 17-35G|
28-70G|28/2|35/2|85/1.4GD|100/2|100/2.8D|135/2.8|200/2.8HSG|300/2.8G|Sigma 10-20

Offline Rob aka [minolta mad]

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Re: Questions and Answers on IR
« Reply #2 on: April 20, 2008, 08:52:53 PM »
No i havent,

I have read on an IR dedicated forum that the Sigma 10-20 produced hotspots on a Canon, but generally, if it produces it on one make of camera it will produce them on most makes ( though this is not always the case )

I also recall from memory that the Sigma 17-35 (if thats the one youre referring to) also produces hotspots, but i cant find where i read it too at the moment.


Rob
« Last Edit: April 20, 2008, 09:09:54 PM by minolta mad »

Offline Rob aka [minolta mad]

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Re: Questions and Answers on IR
« Reply #3 on: May 08, 2008, 07:37:38 PM »
Lenses



Lenses that I have used or know that do cause hotspots

Konica/Minolta 17-70 kit lens
Minolta 17-35 G
Tamron 17-50 f/2.8


I know this list doesn’t have a lot of lenses on it at the moment, but it will be updated as myself and others find lenses that do or don’t work.

Quote
My Minolta 28-70G causes hotspots as well - seems like the G lenses aren't good for IR :(

I know that my old tokina 28-80 ATX-Pro worked and almost kept it for IR due to the hotspots with the 28-70.

Fud


Cheers Fud, have updated lens list

Rob

Offline Rob aka [minolta mad]

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Re: Questions and Answers on IR
« Reply #4 on: June 08, 2008, 08:24:45 PM »
Had a personal message from calosdivega

Quote
Hi minolta mad!

I've tested the Sigma 28-70 EX DG 2.8 with the Hoya R72. Camera was the A700.
The good news, no hot spots on the pics. I can also test the lens with the 5D and 7D (when back from repair).

I like your IR guide very much.

;) Carlos Di Vega


Many thanks i have updated the list


Rob (minolta mad)

Offline LillyViolet

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Re: Questions and Answers on IR
« Reply #5 on: August 09, 2008, 12:43:01 AM »
I just bought a sony 350k for the sole purpose of starting infrared photography. How do you set this thing up to where its not shooting black and red? Ive tried Manual mode and different. exposure settings to no avail. I could use some help.

Offline Rob aka [minolta mad]

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Re: Questions and Answers on IR
« Reply #6 on: August 09, 2008, 03:43:20 PM »
Hi there LillyViolet,
If you havent already read my guide to IR photography then it may be a good starting point. See Here

Where you say "shooting black and red" i can only imagine that you are reffering to this ???
Your shots coming out 'black and red' is normal, and to get the image to display either 'semi normal' colours, this will have to be done in Photoshop or similar (explained in the tutorial, or converted to black and white.)

You will have to shoot in manual at all times when shooting IR.

How long expsures are you using at the moment ???
And any chance of uploading an image, as it will help me see whats going on easier ???


Rob [minolta mad]
« Last Edit: August 09, 2008, 07:45:14 PM by minolta mad »

Offline LillyViolet

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Re: Questions and Answers on IR
« Reply #7 on: August 10, 2008, 12:28:58 AM »
Usually set the exposure 25 sec and f11 on Manual mode. But I have been trying different exposures to see if it would make any difference on the shots and I just get a black image on the screen. Im thinking its because the CWB isn't properly set.  Ive used a white piece of paper, a patch of green grass, etc with the filter on. and I'm shooting in daylight or mid-day from a shade and Im getting the same results. The camera would display an error message with the color temperature after trying to set the CWB. Ive read in other tutorials mentioning that with the correct CWB the images shouldn't turn out red but more of a brownish or grayish tones. How do I get the camera to do that?  I get red images in different modes but never in manual just a black screen and the closest IR image I get is in landscape mode which creates a brown sky but the foliage remains green. Oh, and as it is typical in IR photography to have longer shutter speeds, I dont see a difference in the shutter speeds at all when I adjust it. =/ As for sending you a picture of what I get, well its just black. I hope this information helps. Thanks for taking your time to help me.

Offline Rob aka [minolta mad]

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Re: Questions and Answers on IR
« Reply #8 on: August 10, 2008, 05:19:21 PM »
Strange,
What IR filter are you using ???
As these can make a huge difference to exposures. I knew someone that had an IR filter he used and even with lengthy shutter speeds his images were very dark, almost unusable (120+ seconds) i can only assume that the IR filter you are using coupled with the A350 isnt allowing for very good  IR light transmisitivity.

You are right in what you say about setting a CWB and getting brownish tone's.
You should be able to still set the CWB even though its saying that its an error.

When you set your CWB, are you using a 25 sec shutter speed ???

Speak to you again


Rob [minolta mad]

Offline LillyViolet

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Re: Questions and Answers on IR
« Reply #9 on: August 10, 2008, 08:24:15 PM »
Im using a Hoya R72. I use a 25 sec shutter speed on Manual mode when trying the customize the white balance and I don't get any images at all. Ive tried uploading the black shots on photoshop or adobe camera raw to see if there is any chance of adjusting the black shots to no avail. I dont think the filter is defective because if it was I wouldn't be able to get any shots at all in any of the modes. Yes, it is strange and Ive been trying to figure it out for approx a month. Im beginning to think the camera may be the one at fault or Maybe it's stuck on some setting that Ive overlooked...shouldn't though....But what do you think might be the prob?

Offline Rob aka [minolta mad]

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Re: Questions and Answers on IR
« Reply #10 on: August 10, 2008, 09:05:31 PM »
Quote
But what do you think might be the prob?
You've got me stumped ???

Whats the longest shutter speed you have used ???
Its very strange that youre getting images on other modes, with the IR filter in place but not the IR effect.

As for setting i nearly always use Manual mode, iso 200, f/8, and 20-40 sec exp. WB is usually left in auto as its easier to change it in PS.
So i cant see that you are doing anything wrong !
Its just that.

I'd almsot say, and this is only me thinking to myself. I'd say that the sensor is not susceptable to IR wavelenghts and this is why the images in landscape mode come out the way they do, BUT this doesnt hold any weight as they'd be the same in M mode ???
So unfortunately i dont know what to suggest :-( as this is something i have never come across before.

If you find out what it is and sort it out, please let me know.


Rob [minolta mad]

Offline fother

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Re: Questions and Answers on IR
« Reply #11 on: August 10, 2008, 10:47:07 PM »

Silly question, but are you sure you're using a 25 second exposure, not a 1/25th second exposure? 1/25 is displayed as 25 on the lcd, whereas 25 seconds is displayed as 25" ... I realise this is not likely to be the problem, but worth checking.... :)

Offline LillyViolet

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Re: Questions and Answers on IR
« Reply #12 on: August 14, 2008, 10:47:07 PM »
Funny thing is, I was going to change the exposure to bulb and on my way there 25" worked instead of 1/25 and I logged on and read the response from fother which exactly what I did. I feel dumb now haha because it was so easy. haha.
How do you customize the white balance? I'm not really sure how to set it up because whenever I try shooting under the sun I get a custom WB error 2500k G9. Sorry, Im really new at this. =(

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Re: Questions and Answers on IR
« Reply #13 on: August 15, 2008, 12:17:52 AM »
Don't apologise - no need, everyone was new at this at some point :)

To set the white balance on the a350 (or a300)

       Fn button -> [White balance] -> Select the desired setting

• When [AWB] is not selected, you can finely adjust the color tone with < / > on the controller. Adjusting it toward + turns the image reddish and
adjusting it toward – turns the image bluish.

• Use the white balance bracket function if you cannot get the desired color in the selected option (see page 100 of the manual).

• When you select [5500K] (ColorTemperature) or [00] (Color filter), you can adjust the value to the desired value.

• When you select  (Custom), you can register your setting (page93 of the manual).

      Fn button -> [White balance] -> [5500K] (ColorTemperature) or [00] (Color filter)

• To set the color temperature, select the value with < / >.

• To set the color filter, select the compensation direction with < / >.AWB (Auto WB) The camera automatically detects a light source and adjusts
the color tones.

Offline LillyViolet

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Re: Questions and Answers on IR
« Reply #14 on: August 20, 2008, 07:36:56 PM »
Ive tried the cwb but Im not sure exactly what Im suppose to take a pic of and the precise time of day to take the shot.  I tried white paper, green grass, leaves and made sure it took up the whole screen and did it during daytime around the afternoon but I still get an error. Should I keep trying until the error message doesnt show up?