Jump to content

nestor_alvarez

Members
  • Posts

    10
  • Joined

  • Last visited

Everything posted by nestor_alvarez

  1. Yes, I do not have a problem with that, my problem is that when I change the filters (Y and M) to increase contrast, according to the Durst instruction manual it is not needed to change exposure as all the possible combinations render an equal exposure. But I get a less contrasty instead of more.
  2. Joe, what a lesson. Thanks!. All the information provided is very valuable to polish my art. I have experience with reciprocity in films but not in paper. Your information will help me out in this area on papers. Yesterday I tried to calibrate my Durst probe / meter to a negative that I printed with the right exposure / contrast according to my view. But I did not succeed. If I cannot do it after another tries I will buy an enlarger meter.
  3. Thanks Joe regarding the recommendation to leave the print in the development tray more time instead of less. I do not have a problem with cold temperature as I live in Miami and usually what is difficult for me is getting the developer at 20C as it will normally go to 24 or 25 C alone. In order to keep it at 20 C I need to place a bag with ice into the tray and measure the temperature until it reaches 20C. I am printing basically 6x6 so f11 is two stops before maximum aperture. I arrived at 21 sec after the second test strip were I considered the 20sec strip a little underexposed and the 22sec kind of over, so I decided 21sec.
  4. Thanks Alan! Very practical and detailed explanation. I am currently developing as you mentioned (about 90secs) and then place in stop and fix for 1min. Most of the time the paper is face down. I also make sure that the agitation and developer temperature is 20 deg C. What I am not doing is changing the exposure time at different filter grades. I did all (from grade 1 to 5) at 21sec f11. Do you agree to change exposure time, and in that case what percentage change from grade to grade do you recommend to start with? Thanks again for your explanation of how filters work!
  5. Thanks Joe. My next step will be to increase exposure when I increase contrast, even though the color enlargers with the three filters are supposedly made to keep the exposure constant at different contrast grades.
  6. This is what I did yesterday at 0Y/170M and it came almost white. What is more troubling is that when I do a 75Y/10M (supposedly a grade 1) is more contrasty than a 34Y/45M (grade 3) up to the extreme that a grade 5 (0Y/170M) came almost white, loosing all details. All the rest is constant, same exposure at 21sec f11, same developer (BW-65 from Photographers Formulary), same time 90sec with same agitation at same temperature. All with Oriental Seagull VC paper
  7. Hello, About 3 years ago I changed my photography to 100% analog. I installed a darkroom in the garage and the results have been quite interesting and I can see my own improvement in developing / printing. One area which became totally frustrating is the control of contrast with the Durst AC 707. I use the table provided by Ilford papers in relation to the combination of magenta and yellow filters to reach a desired grade with VC papers. I used Ilford, Ultrafine Silver Eagle and Oriental Seagull. With all of them I get the same results: when I want to increase contrast (for example from grade 2 to grade 3) I get a print that is considerable with less contrast instead of more. I made a try from extremes (without filters, with filters at grade 1 and with filters at grade 5) and the results were amazing: the most contrasty print is the one without filters, then the one at grade 1 and the print at grade 5 is almost all white. I used the same exposure (21 sec at f11) for all of them as it is supposed that the combination of filters (between magenta and yellow) are predetermined to use the same exposure. Any help on this area is more than appreciatted!!! thanks, Nestor
  8. I have just received 10 120 Ektar 100 rolls scanned from North Coast Photographic Services with a note on 3 rolls "120 Backpaper shows through image". Not all the images of these 3 rolls are affected, but the ones with a clear blue sky, it is very noticeable the word KODAK and some numbers (mainly 8 and 9). The Lab did an excellent development and scanning but some rolls ( 3 out of 10) have this problem. Anyone knowing what are the latest news regarding this? Thanks.
×
×
  • Create New...