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Photo Forum / Film Photography / 35 mm / April 2008Faking DX encoding
Someone gave me a camera that does not have manual exposure compensation which sets film speed by reading DX encoding. I have bulk Ilford PAN-F which I would like to use in the camera, but no resuable DX encoded cassettes. The camera defaults to ISO 100 with no DX encoding, so I can use it in manual mode and try to remember to overexpose by one stop. However, I'd love to be able to fake the ISO 50 DX encoding. Anyone have any suggestions? Note that I am NOT!!! in a country where I can mail order DX encoded reloadable cassettes. Thanks, Geoff.  SignatureGeoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM > Someone gave me a camera that does not have manual exposure compensation > which sets film speed by reading DX encoding. I have bulk Ilford PAN-F [quoted text clipped - 12 lines] > > Thanks, Geoff. If you can get metal tape (commonly used as shielding on small appliances), you can cut to size and put on the cassettes in the appropriate places. If you can't get hold of metal tape, you could try metal paint (so long as it is conductive), or glue small pieces of alfoil to the cartridge. If you are only ever going to use the camera with the same ISO, you could try shorting the contacts inside the camera to the appropriate ISO. There are plenty of resources on the net for the actual position of the tabs to set various ISO's. Out of interest, what camera? > If you can get metal tape (commonly used as shielding on > small appliances), you can cut to size and put on the [quoted text clipped - 10 lines] > > Out of interest, what camera? Thanks, I found one at the wikkipedia. The metal tape is a great idea, I can ask a friend in the appliance business for it. The camera is a Pentax SP10. For a consumer camera (I'm assuming since you could not overide the ISO, it was aimed at consumers), it has a big bright viewfinder. Far better than the Fx5 (55,65,75) Nikons and the Canon EOS 300 (Rebel?). Geoff. SignatureGeoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM >> If you can get metal tape (commonly used as shielding on >> small appliances), you can cut to size and put on the [quoted text clipped - 22 lines] > > Geoff. I believe DX coding stickers can be ordered from places like Porters, and Adorama. These can be placed on the canisters, so the cameras will read them and go to the correct ISO setting...... >I believe DX coding stickers can be ordered from places like Porters, and >Adorama. These can be placed on the canisters, so the cameras will read them >and go to the correct ISO setting...... Go to ... http://porters.com/ ... and search on "DX labels". They cost $5.49 for a pack of 10, plus shipping. > Thanks, I found one at the wikkipedia. The metal tape is a great idea, > I can ask a friend in the appliance business for it. Just a thought though - some (most?) of it has a thin clear plastic insulation layer. Pretty elementary though to scrape it off. > The camera is a Pentax SP10. For a consumer camera (I'm assuming since > you could not overide the ISO, it was aimed at consumers), it has a > big bright viewfinder. Suspected it was a Pentax - I assume the SP10 is a foreign designator of the SF10, which as you say has no ISO adjustment or exposure adjustment. In theory the SF10 has "Automatic Contrast Control" method of exposure compensation, which _in theory_ does away with the need for exposure compensation. Usually does work ok, although doesn't allow you to deliberately override ISO for push/pull of films or non-DX films. > Far better than the Fx5 (55,65,75) Nikons and the Canon EOS 300 > (Rebel?). Agreed. One of Pentax's strengths has always been their exposure system. I've got an MZ-60 which I normally keep loaded with either Sensia or Velvia. The MZ-60 has the same system as the SF10, and I've found it to be exceptionally accurate for exposure. (Fortunately though the MZ-60 has ISO override, which is handy when I use B&W). Other than the odd shot in very low light (outside the meter's range), I can't say it has ever got exposure fundamentally wrong. I don't know why, but it appears they haven't put the same smarts into the K10D, which frequently gets the exposure very wrong (admittedly it is better than the Canon's I have used). > Geoff. >> Thanks, I found one at the wikkipedia. The metal tape is a great idea, >> I can ask a friend in the appliance business for it. > Just a thought though - some (most?) of it has a thin clear > plastic insulation layer. Pretty elementary though to scrape > it off. The silver squares on the DX code have to all be electrically conntected together. It would be better to scrape off the whole area to bare metal and use insulating tape for the black squares. Peter. Signaturepirwin@ktb.net > Someone gave me a camera that does not have manual exposure compensation > which sets film speed by reading DX encoding. I have bulk Ilford PAN-F [quoted text clipped - 12 lines] > > Thanks, Geoff. No problem! Google for "Porter's Camera Store" and search for their DX stickers. They come in various ISO ratings, and you just affix them right over the DX coding on your existing film canisters. They've been sold for years. > Google for "Porter's Camera Store" and search for their DX stickers. They > come in various ISO ratings, and you just affix them right over the DX > coding on your existing film canisters. Thanks, I looked them up. They have ISO 40 but not ISO 50. That comes out to 1/2 stop over exposure, which I'm not sure will matter that much. Geoff. SignatureGeoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com N3OWJ/4X1GM >> Google for "Porter's Camera Store" and search for their DX stickers. They >> come in various ISO ratings, and you just affix them right over the DX [quoted text clipped - 4 lines] > > Geoff. You can buy them for ISO 200 film and cover the #3 postion or you can buy them for ISO 800 film and cover the #4 position. Either option will give you ISO 50. There is a chart here that explains the coding: http://www.bythom.com/dxcodes.htm > > Google for "Porter's Camera Store" and search for their DX stickers. They > > come in various ISO ratings, and you just affix them right over the DX > > coding on your existing film canisters. > > Thanks, I looked them up. They have ISO 40 but not ISO 50. That comes out > to 1/2 stop over exposure, which I'm not sure will matter that much. Well, it's a 1/3 stop actually so it will matter even less. Robert |
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