Better IR Effect - 720nm or 760nm?

[john romano]

<p>I use Rollei and Efke 4x5 Infrared film. I have been using Hoya 72 filters, which approximately transmit at 720nm.</p>

<p>I'm looking for a more pronounced effect of infrared with the Rollei and Efke films. I'm going to use some 760nm filters today, but I'm soliciting ideas from the photo.net community of ideas. Basically, I need a higher degree of whites in my images.</p>

<p>I have used a tested a number of developers over the past few years, and I settled on FA-1027, but I still need a little more "punch" in my infrared images.</p>

<p>Any ideas on filters, etc.?</p>

<p>Thanks so much in advance for your contributions.</p>

 

[lwg]

<p>If I remember correctly the Rollei will give blank images with the 760nm filter (at least that's what I think the cutoff is with my cheap filter from ebay is). The Efke is still sensitive down to 820nm. For the Rollie I stick with the 720 filter.<br>

My advice is to bracket your shots, and err towards over exposure. That also tends to bring out the glow. As far as getting more whites, I assume you want more infrared effect. For that the Efke with the 760nm filter will give you that.</p>

[thirteenthumbs]

<p>I have only considered shooting Infrared B&W but after a few minutes of searching photo sites I found that <strong>both </strong>film you asked about are sensitive up to 820 nm.<br>

<a href="http://www.digitaltruth.com/products/product_tests/infrared_film_002.php">http://www.digitaltruth.com/products/product_tests/infrared_film_002.php</a> is a comparison of the two.</p>

<p>You may want to switch to Efke IR820 Aura, same as Efke IR820 but without a anti-halation backing. All 3 are available from Freestyle.<br>

<a href="http://www.freestylephoto.biz/sc_search.php?rfnc=405">http://www.freestylephoto.biz/sc_search.php?rfnc=405</a></p>

[hoshisato]

<p>The confusion around the Rollei film might originate from the fact, apart from <a href="http://www.gommamag.com/v4/downloads/data/005_page/other_rollei_links/Rollei_infrared.pdf" target="_blank">Rollei Infrared IR400</a>, the <a href="http://aurelien.le-duc.perso.neuf.fr/Photo/The%20Rollei%20RETRO%2080s.pdf" target="_blank">Rollei Retro 80S</a> film is also sensitive to the infrared wavelengths and sometimes used for IR photography. The Rollei Retro 80S is only sensitive up to 750nm, or so, which will indeed give blank images with the filter you mentioned.</p>

[Fotohuis RoVo]

<p>Even the Rollei Retro 400S and Super Pan 200 you can use for IR photography. But all are going down quickly in sensitivity over 750nm. RG715 Heliopan or R72 Hoya 720nm is the best solution.<br>

For Efke IR they are going more straight to 820nm so you can go up a little bit in filter value however also here 715nm or 720nm is almost an optimum.</p>

[john_shriver]

<p>Looking at <a href="http://www.mahn.net/TA820ce.pdf">this data (see page 9)</a>, you have a little sensitivity between 760 and 820 nm with the Efke film. But nothing like Kodak HIE, which went almost out to 900 nm.</p>

 

[john romano]

<p>LG and Robert:</p>

<p>You were correct. The Rollei IR film will PRODUCE NO IMAGE with a 760nm filter, but the Efke film will produce a beautiful image with the 760nm filter.</p>

<p>Therefore, I can only use the Hoya 72 (720nm) filter with Rollei film. To get "punchier" whites, I'll have to adjust my exposure by 1/2 to 1 stop (open).</p>

<p>Thank you everyone for your input and advice!</p>

<p>Much appreciated!</p>