| Joined: | Thu Apr 19th, 2012 |
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Eric wrote:
TomOC wrote:
Eric-
I forgot why I stall out each time I go to get a camera converted... What the heck is the deal with all the different types of conversions?
What did you get for the ex1? I'm thinking R72/89B IR filter installation (720nm) from SpencersCamera.com for $250???
Does that make sense. They offer 5 different conversions !!!
Thanks,
Tom
Mine was the 720nm.
I find it gives a cleaner, more 'duotone' effect of white and brown.
Some of the other filters introduce reds and purples which can give weird effects (IMHO) when post processing.
It's sort of akin to tinting a black and white print ...compared to tinting a colour print. With only mono to work with you get a purer result. Tint a colour print and everything is unpredictable.
Just my 2cents.
Thanks, Eric.
Just what I wanted to know. I really care 95% about BW only.
Off to order the 720n
Cheers,
Tom
Just as a heads up on the choice of lens....
I have the 18-55 and 55-200.
Firstly for landscapes 18mm, =24mm, isnt quite wide enough for wide landscapes that make IR work so well. (that isn't to say you can't work tighter with IR, I've done some interesting close ups)
Working with the 18-55 I have discovered it has the potential for a nasty hotspot. Initially I thought it was a total right off but on further investigation it's clear that the wider the focal length AND the smaller the aperture, the worse the hotspot shows.
For example ...at 18mm and f8 the hotspot is bad...at f16 it's like a spotlight down the centre of the lens!!
I have deduced that from 18-34mm you must work at no more than 2stops down from max aperture. From3 35-55 its a more generous 3-4stops.
This explains why the 55-200 is acceptable at f8 (my preferred aperture for IR)
All this means is that unless I use f4 I can't use the 18-34mm range. But as I said earlier, this is already not wide enough at 18mm.
So when I get back from Italy, I must check the 14mm prime to see whether it too, has a hotspot. If its ok, then I will use it on the IR (still there for colour use of course). If its no better, I need to rethink the usefulness of this exercise.
It's really cool having a lightweight kit for both colour and IR. I have been clambering round a medieval town in Umbria the last two days and the backpack has been barely noticeable. But if I have to spend hours correcting image defects in photoshop ...it's going to become a point of irritation, and lose its appeal!
Fingers crossed the 14mm is ok.
Edit...can I just add that there is a reason for using f8 with IR. You get a sufficient depth of field to ensure compensation for the focus shift due to IR. Of course the camera has, or should have, been recalibrated but it's still a bit of a black art...imho
Last edited on Tue May 13th, 2014 15:10 by Eric
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Eric