Efke IR 820 Exposure

Steffen_Muc · 2011-08-22T18:29:43+00:00

Hallo NG, ihr könnt mir unbedingt helfen, ich habe Probleme mit der korrekten Belichtung des Efke IR820. Ich bin folgendermassen vorgegangen: - Filter IR 7...

Steffen_Muc

Hello NG, I really need your help; I’m having trouble getting the exposure right with the Efke IR820. Here’s what I did: - IR 715 filter - Exposed at 3 ASA (I usually did a test series, determining the aperture and shutter speed using an external light meter) - Development: 9 mins in Rodinal 1+25 at 20°C (shake for the first minute, then 3 times every minute) Result: the negatives are (almost) transparent; there’s practically nothing on them! What am I doing wrong? Is the filter wrong, or are the development times incorrect (I got them from the internet)? THANK YOU for your help!! Best regards from Munich, Steffen

MirkoBoeddecker

Hi Stefan, If the reference exposure (i.e. the frame numbers and the Efke IR820) is darker than your images, you’ll need to expose for longer. If the whole negative is too faint and even the frame numbers are barely visible, you’ll need to develop it for longer. I’ve written something about this, but so far only in English: http://www.adox.de/english/FilmDeveloping/FilmDeveloping/Informations.html Best regards, Mirko

Steffen_Muc

Hi Mirko, The numbers and the film name are much more vivid than the images. The strange thing is that I’ve developed this film exactly the same way before, but back then I had an exposure of 10 ASA (almost everything was just transparent). Even at 3 ISO, there’s practically nothing on it. Could it possibly be that my filter is far too strong? If the film isn’t sensitised that far into the IR range, then I might be filtering out too much. I’ve been using Rollei film so far, and the filter worked really well with that. Thanks in advance for your help! Best regards from Munich, Steffen

MarcS

Hi Steffen, It’s certainly not down to the filter; I use Efke IR820 very often with the 695 and 780. I usually perform an exposure at f/8 for 30 seconds to 1 minute in strong sunlight, depending on the shade, which doesn’t quite add up at 3 ASA (it would be less than 1 ASA) Without direct sunlight or in cloudy conditions, the exposure times increase drastically. Regards, Marc P.S. The developer is Ultrafin+ (1+4) for 8 minutes at 20°C. Example attached…

MarcS

OOPS....I meant seconds, NOT minutes, of course! Marc

Steffen_Muc

Hi Marc, What do you mean, f/8 and half a second? After 16 seconds, there was hardly anything on my negative. What speed setting are you using? I’ll give the next roll a go with Ultrafin Plus – I assume you agitate it continuously for the first minute and then three times every minute after that. Is that right? Thanks for your help! Best regards, Steffen

MarcS

Hi Marc, What do you mean, f/8 and half a second? After 16 seconds, there was almost nothing on my negative. What speed are you using?

Hi Steffen, I don’t quite understand what lighting conditions you’re using to get 16 seconds at 3 ASA? In sunlight, at 3 ASA I get about a 1/15th of a second at f/8. I always shoot infrared outdoors without a light meter, going by gut feeling, and the variations are: Strong sun, lots of greenery (nature) with no shadows: f/11, 1/2 second; with shadows: f/8, 1/2 second Strong sun in the city with shadows: f/8, 1/2 second to 1 second Cloudy, little sun: f/8, 1 to 3 seconds Otherwise, I’d tend towards 1 ASA I can’t imagine it’s down to the developer; I’ve developed in Rodinal (1+25) before (approx. 7 mins) Yes, standard agitation... agitate for 1 min, then agitate for 10 seconds every minute.... and rinse for about 2 minutes beforehand Regards, Marc PS... from the photo you can clearly see that the aperture is quite small, and you can tell from the trees that the exposure time was relatively ‘short’ ;)

WolfgangF

Hello Steffen, I’ve just come back from holiday and tested the Efke IR 820 whilst I was there. Good, consistent results with well-defined negatives using the following settings: Sunlight IR 715 filter Exposure at 0 ASA / DIN Handheld light meter on grey card and light metering Rodinal 1+50, 20°C, 11 mins, agitation every 30 seconds 3 ASA was too dark 6 ASA was far too light Best regards, Wolfgang