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02/05/2006 04:04:29 PM · #1 |
Whats the difference between a Hoya r72 and a Hoya rm72? Is there a difference?
I'm trying to find a IR filter for my Canon G3. |
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02/05/2006 05:15:32 PM · #2 |
Did you mean RM90? I wasn't aware of an RM72, just the R72. Here is a link to help understand the difference... essentially the RM90 has a cuttof that is deeper into the infrared. This will mean longer exposures and a maore dramatic IR effect.
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02/05/2006 05:21:17 PM · #3 |
I think it was a typo; the Hoya infrared filters are all called RM. The 72 stands for the wavelength (lower threshold) at which the filter blocks 50% of incoming light. With this case being 720nm (0% at 680nm). This is the Wratten equivalent of #89B. B+W has an equivalent filter the 092.
I personally like the higher threshold of the Wratten#87c, but Hoya doesn't make one, only the B+W 093.
I would recommend, however starting out with the lower cut off #89b (Hoya RM72) as the resulting images are usually easier to shoot (and process).
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02/05/2006 05:26:16 PM · #4 |
The Hoya R and IR series are fast cut-off, where the RM series have a more gradual cutoff. Both series exist, but I think the R72 is the only option in the 720nm range.
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02/05/2006 05:31:28 PM · #5 |
RM72 would be the typo. I have the Hoya R72, no M in it. I can't quite get it to work very well with my cameras. Of course that could just be me, actually it probably is just me. I am not very good. :S
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02/05/2006 05:35:28 PM · #6 |
Originally posted by turdave:
RM72 would be the typo. I have the Hoya R72, no M in it. I can't quite get it to work very well with my cameras. Of course that could just be me, actually it probably is just me. I am not very good. :S |
not a typo...check it out...I just confused myself...I didn't think they made a rm72...maybe B&H are wrong??
//www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=23078&is=REG&addedTroughType=search
Message edited by author 2006-02-05 17:36:36. |
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02/05/2006 05:40:06 PM · #7 |
philuo & kirbic,
You are right, I pulled out my Hoya, and it states R72. B&H's web site calls them all RM. However, I like the B+W's versions better, because they don't seem to bloom like the Hoyas, better coatings I would assume. |
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02/05/2006 05:41:27 PM · #8 |
That is the one I bought. On the filter itself it says R72.
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02/05/2006 05:44:46 PM · #9 |
Cool, thanks everybody for helping me understand!
I'm excited to take pictures with it. Which I'm sure it will take me a while before I get it right!
Message edited by author 2006-02-05 17:45:53. |
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02/05/2006 05:47:49 PM · #10 |
INteresting, they do list an RM72 in a whole series of sizes. Was not aware of that, perhaps it's a new offering?
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