Large Format Photomicrography part: X

For absolutely silly reasons I’ve done this a bit out of order. By all rights I should have exposed and processed my first contact print in my improvised darkroom using open trays. Under the light of my spray painted night light “safe light” I could easily set up my exposure and observe the level of development as it progresses. That would give me a ready idea of the required development time and let me somewhat adjust for over or under exposure by pushing (extending) or pulling (limiting) the developing time.

The Changing Bag Contact Prints

Loading everything into the changing bag wasn’t too terrible. The worst part of the whole thing was being entirely unable to see if I was aligning the contact paper up with the negative. I had to resort to tracing the outside edge of one of the metal slats and slowly bringing the edge of the paper up to it. It was all the more hard as the changing bag prevented me from fully opening the lid of the contact printer. The lid fails to stay in the open position unless fully open so it was all the more difficult as a result. Patience was the key and below is the first result.

1 sec 2x40

Overexposed contact print

This first contact print (at left) was made using the decades old dual 40 watt Mazda bulbs that were installed in the contact printer when I received it. The exposure was made for one second after which it was processed in Dektol for just under 45 seconds with constant rotary agitation followed by a two minute plain water stop bath. The print was then fixed for two minutes using a 1:7 dilution of Kodafix. As may be seen the print is exceedingly overexposed having hardly any definite texture in the legs of the opilione (daddy long legs spider) and none in the body. I drastically underestimated the brightness of the lamps serving as the light source. I took into account that with the contact printer the distance from the light source was easily ten times shorter than that one would use with an enlarger and working the manufacturers data sheet describing the paper as 30 times slower than normal papers I selected a one second exposure and well, at least it was educational.

3 sec 2x15 d

Unevenly exposed contact print

With the above as a reference point I looked at what I had available in the way of medium base (medium Edison screw, or E27) bulbs. Failing to find anything less than 40 watts with a frosted or opal glass I settled on a pair of 15 watt night light sized clear bulbs—the type used in the B&L Opti-Lume illuminator. Apart from being significantly lower in wattage, the night light bulbs are much smaller physically and have a shorter total filament length. In the second print (at right) I used an exposure time of three seconds and processed the print as above. The results were better than those had in the first contact print but still quite a bit off from acceptable. The mounting hardware in the contact printer is on one side only so that two full sized bulbs have their filaments centered beneath the frosted glass. The smaller bulbs were far from centered and an internal wire partially occluded one of the bulbs.

Tray Processed Contact Prints

3 sec 2x15

Preferentially developed right corners with tray development

Resolved to get something much more like an acceptable print from the contact printer I adjusted the position of the internal wire and repeated the three second exposure with the night light bulbs and a different negative. This time I worked in my improvised darkroom and processed using Dektol and Kodafix in an open tray. I used a plain water stop in a third larger tray. Trying to be too clever for my own good in my first attempt at tray processing I sought to overcome the effect of the off center bulbs in my contact printer. I used roughly a minute and a half of total processing time and for nearly a third of that I held the side that corresponded with the bulbs out of the tray using my tongs and preferentially developed the opposite side of the print. The results as seen at left aren’t more even as a result, if anything they’re less. Rather than being more even the one side is significantly less developed overall and there’s somewhat less overall contrast. With little experience on the matter I’ll tentatively attribute this to the far lower rate of agitation I was able to achieve in the trays as compared to the constant agitation in the rotating print drum.

At this point I decided to make an attempt with my photographic enlarger. I had actually bought the enlarger on whim on the off chance that I’d one day be sufficiently enthusiastic to have a go at putting together a darkroom. The portable enlarger by Ilford isn’t able to handle a 4×5 negative for enlarging but it will work for a contact print. I began with a 15 second exposure time and processed in trays. When after the first minute of developing nothing was visibly happening with the print I started to think I must have had the print upside down in the printing frame. I tossed it in the general direction of the water tray and moved on, setting up another sheet of contact paper on my printing frame. Then I noticed something on the print that lay in the sink beside the water bath, it had developed to a limited extent! I gave it another couple minutes in the developer and started to see it a bit more clearly, at which point I put it in the water stop bath and thence into the fix. The result is below on the left. I left it in the water bath while I exposed the next attempt.


For the second print with the enlarger I used an exposure of 30 seconds, two minutes in the developer, two in the water stop, two more in the fix and then into the water bath. I ran the water from the sink into the water tray while I poured the chemistry from the trays back into their storage bottles. I made small hash marks on the masking tape labels of the bottles so that I could gauge the remaining capacity of the solution in the bottles. With that done I took the prints one by one and hung them to dry.

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