EFKE Infrared 820c Test images

[georg16nik]

we are facing that direction over here as well.

 

[cmo]

A good laugh will warm you up

(there was a url link here which no longer exists)

 

[georg16nik]

That was a good one!

 

[DWThomas]

By the way, did anyone here ever try the RG715 vs. the RG780? The latter probably creates a stronger IR effect and longer exposure times. As these filters are not exactly cheap I don't want to buy both to try on my own

I've shot a 720 and a 760 with the EFKE film; it wanted maybe one more stop exposure with the 760. I assume the 780 would probably still be reasonably workable.

The actual filters were a Bower IR72 and a "Neewer" IR760 from the Far East, (both via ePrey) so I'm not sure how the filter specs and quality compare. The Bower in 77mm was $47 and the 760 was $14 for a 67mm, in case anyone wonders what drove the decisions.

I should comment though that with the Rollei IR400 film, should you wish to try that at some point, going from the 720 to the 760 added more like six stops -- one is very definitely working down the cutoff there.

 

[cmo]

Thanks... apart from the 1 stop, what is the difference? I would expect a slightly stronger IR effect.

 

[DWThomas]

Thanks... apart from the 1 stop, what is the difference? I would expect a slightly stronger IR effect.

Yes, I would say a little stronger. It's funny, I spent several days working with both filters and both films, but moving to different locations trying to expedite a "project." I'm left feeling there were so many differences associated with time of day, lighting and the general scene that I don't feel I have a truly reliable A/B comparison. I have another project in mind for late spring that might allow doing some better comparisons. (Well, I get these crazy ideas .... )

I have a bunch of stuff on PBase that shows some results.

 

[deandadin]

Efke IR film details.

I am teaching an IR class. We are concentrating on digital IR and film IR. On saturday we covered film IR using the Efke IR B&W films. I used the regular and the Aura for the test. I did not find that much difference between the two films, they both worked equally well. I did not see much haloing with the Aura film. Initially I used an ASA of 25 to expose both rolls and I went through all of the shutter speeds at F 11 to see which one would give me the best exposure. This was just a test for the class. By the way I own a pro B&W lab in Culver City in California so I am very familiar with B&W processes. I used Tmax RS developer and I processed one roll for 8.5 minutes and the other for 11 minutes using a Jobo rotary processor. I shot the 120 version of the film. The first exposure on the film was at 30th of a second at F 11, indicated by the meter, and I went through all of the shutter speeds using a Mamiya RB 120 camera. The meter reading was under exposed and the exposure that had the best results was the exposure at 1/8th of a second at F11. This effectively showed that the correct asa for the film was really asa 6. The frame that was the good frame gave a superb IR photo and I will use that setting. Once again I found that the correct setting was at ASA 6 with a shutter speed of 1/8th of a second at f11 and the developer was TMX rs developer for 11 minutes. We did 2 rolls and developed them for 8.5 and 11 minutes but the one developed for 11 minutes gave a slightly better negative. I really love this film. It has a wonderful IR look and it comes the closest to the Kodak HIE film in IR. The film should be loaded in a darker area, total darkness is not necessary but it should be very subdued light. Well, thats it, I hope that this is a help. I will try to post some images when I have time. One other thing, I used the Hoya #R72 IR cutoff filter, lighter red filters dont work that well. I will also be using the Tiffen 87 cutoff filter in the future. There is also the B&W W093. The Tiffen is less expensive then the Hoya, the Hoya is around $240.00 for a 77mm size. The Tiffen is about $135.00 and they both do about the same thing. I have seen these filters on Ebay and you can check with KEH camera and see if they have them used also. Have fun shooting IR.

 

[deandadin]

I use the Hoya 72 filter also. I did testing and I found that a good effective speed for this film is 6 with an exposure of 1/8th of a second at F11. I develop the film in TMX rs developer for About 10.5 minutes. I am using the 120 version with a Mamiya RB camera. I hope that this helps you.