Exposure correction for Hoya 720

[norm123]

I tried SFX with the Hoya 720 filter and applied a 7 stops correction...too dense!

I want to try Rollei 400 (MF). 5-6 stop correction with full sun is OK?

Regards
Normand

 

[gijsbert]

Yes, 5 stops already works quite well, 6 gives the shadows a bit more definition but I prefer higher shutter speeds with 5 stops.

 

[Truzi]

That sounds good for the Rollei IR400. Like gijsbert, I prefered +5 and +6, but +7 seemed okay for me. I've only scanned so far, and I've more IR negatives, but haven't scanned them (and I may just print them instead of scanning).

Here is a thread I had started some time ago on the subject:
(there was a url link here which no longer exists)

I had used the Rollei Retro 400s, but have had similar results with the Rollei 400 IR (there have been debates on the names of the film and whether it is exactly the same - but effectively it seems to be).

In that thread I posted a few pictures I uploaded to Picasaweb (now redone by Google). I did one shot without a filter, and then bracketed using a Hoya R72. I was doing a quick test, messed up developing a bit, and there is one set where I forgot to put the filter on after focusing. Here are the photos.
https://get.google.com/albumarchive...RvAISFcRyq?source=pwa&authKey=CNzwpYmxzMPbmwE

If you click a picture to view it individually, the notes show shutter speed, aperture, and about what I think the exposure was (I'm not good at this, lol). I found +5 to +7 did well (5 to 7 stops correction). These were in 35mm, on a tripod.

 

[norm123]

That sounds good for the Rollei IR400. Like gijsbert, I prefered +5 and +6, but +7 seemed okay for me. I've only scanned so far, and I've more IR negatives, but haven't scanned them (and I may just print them instead of scanning).

Here is a thread I had started some time ago on the subject:
(there was a url link here which no longer exists)

I had used the Rollei Retro 400s, but have had similar results with the Rollei 400 IR (there have been debates on the names of the film and whether it is exactly the same - but effectively it seems to be).

In that thread I posted a few pictures I uploaded to Picasaweb (now redone by Google). I did one shot without a filter, and then bracketed using a Hoya R72. I was doing a quick test, messed up developing a bit, and there is one set where I forgot to put the filter on after focusing. Here are the photos.
https://get.google.com/albumarchive...RvAISFcRyq?source=pwa&authKey=CNzwpYmxzMPbmwE

If you click a picture to view it individually, the notes show shutter speed, aperture, and about what I think the exposure was (I'm not good at this, lol). I found +5 to +7 did well (5 to 7 stops correction). These were in 35mm, on a tripod.

Thank you so much for detailed answer.

 

[Hatchetman]

I used +5 stops with a 720 filter and Kodak HIE. Looked good to me.

 

[norm123]

Yes, 5 stops already works quite well, 6 gives the shadows a bit more definition but I prefer higher shutter speeds with 5 stops.

Thank you.

 

[gijsbert]

Cool to see those brackets tests, Truzi. Which reminds, me I did a small bracket test as well: https://goo.gl/photos/3MUGPC4KH53ZijRV7 (no filter, red 8x, R72 32x, R72 64x)
This was Rollei IR 120 but 400S seems to work the same.

 

[pentaxuser]

Truzi, thanks for the link. As others have said and as I suspect, even at +5 stops the strong IR "look" will be retained and the shadows will still be very open. With a wide angle 28mm lens for DoF and at EI 12 on a sunny day at f8 I can see shots being at a comfortable exposure.

pentaxuser