Author Topic: Questions and Answers on IR  (Read 83087 times)

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Offline balacau

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Re: Questions and Answers on IR
« Reply #120 on: September 29, 2010, 08:23:54 PM »
When I was referring to artificial light, I really meant a picture taken at night with the only light source being of the artificial kind.  I am not sure what that would look like in the IR spectrum although it'd be interesting to find out.

What kind of lens would you most recommend for IR shots?  Primes maybe?  Large aperture, etc?  I did see the Sigma 10-20mm had an issue with hotspots so perhaps super wide angles/fisheyes are unsuitable.

Best regards

Gavin
« Last Edit: September 29, 2010, 08:29:14 PM by balacau »
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Offline Rob aka [minolta mad]

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Re: Questions and Answers on IR
« Reply #121 on: September 29, 2010, 08:32:36 PM »
Ah, now i see !

Not sure what the results would be like, i expect it would require a very long shutter speed (several minutes) to get an image.
Would be interesting to find out though.
I may try later, just taking an image indoors to see ???

My first choice of lens for IR would be the minolta 35-70/4 or the 24-50/4.


Rob

Offline balacau

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Re: Questions and Answers on IR
« Reply #122 on: September 29, 2010, 08:41:24 PM »
Several minutes exposure time eh, wow that'd get you maybe 12 shots per battery charge lol.  I think I've done 30sec exposure before!  I'd have to consult the manual for anything over that!  After that point, the BULB option comes up...

Hmm I have neither of those lenses...the kit lenses aren't good enough quality I guess to get a decent image with an IR filter.  Perhaps an ideal time to try the Tamron 90mm macro.

I'd be interested to see what the IR pictures using artificial light turn out like.  It could be a new twist to the regular carpark pictures.

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Gavin
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Offline Rob aka [minolta mad]

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Re: Questions and Answers on IR
« Reply #123 on: September 29, 2010, 09:14:00 PM »
Yes, you will need to use the bulb option and a cable release of some sort and either keep it pressed, or lock it open if its a minolta/sony one.


Rob

Offline balacau

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Re: Questions and Answers on IR
« Reply #124 on: September 29, 2010, 09:16:03 PM »
Yes, you will need to use the bulb option and a cable release of some sort and either keep it pressed, or lock it open if its a minolta/sony one.
Rob

Excellent, that answers two questions in one go.  Thanks very much for you help Rob!

Good luck with the "artificial IR" shots.

Best regards

Gavin
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