small exposure time for printing

The developer strength is OK, it's possible your negative is too thin, underdeveloped and/or underexposed, Also what enlarger and what wattage bulb ?

Ian

 

Great to hear that you have started wet printing! It's the best part of photography in my opinion.

What size of paper are you using? The closer the lens is to the paper, the less time it takes to properly expose it.

The developer should not have a major impact on development time.

 

You're not the first person with this issue. Generally it's not a problem unless you're trying to dodge and burn or do some other kind of manipulation where you need more time. If you do need more time, you might consider trying a weaker bulb, or if you have a filter slot above the negative carrier, you might try a neutral density filter or some other type of filter to cut down on the amount of light (I use a sheet of semi-opaque plastic I cut out from a container for this). You could also attach a standard neutral density filter to the enlarging lens. Or use a longer focal length enlarging lens which would cause you to have to raise the head higher and thus decrease the amount of light hitting the paper.

 

Your problem is with the exposure, are you makng a very small print? If not your enlarger may have an overpowered bulb in it. If its a standard screw base you can get enlarger bulbs different wattages or your type of bulb may come in different outputs for the type. If all else fails a dimmer can be put in line to cut the power but be aware this will redden the light and have an effect on filtration for color printing and possibly variable contrast printing.
Some people opt to use a neutral density filter to reduce the light.
You didnt state what enlarger you have and how its set up, this will have a bearing n what you can do to solve your problem.

 

Actually a longer focal length lens will have little effect on the brightness at the same projected size, what will make a difference in longer lenses often has a smaller minimum aperture than a wide lens and allow you to stop down a stop or two more. It also affords more working space under the enlarger.

 

Zone VI workshop book...by fred picker
Learn to make a proper negative and minimum time for maximum black with your enlarger
EASY AFTERWARDS

 

There is an inverse square relationship between distance and light intensity, so if your 2x closer the light intensity is 4x greater. In terms of figuring out time: new time T2 = T1(distance2^2/distance1^2). If your T1 is 5 seconds exposure at a d1 of 6 inches the new time at 12 inches would be 20 s. 2x greater distance = 4x more time. Does it work in real life? I agree magnification would take care of variables other than just distance.

 

A 10x7cm print from 35mm with a 100W bulb and (presumably) a 50mm enlarger lens will indeed result in dramatically short print exposure times, especially with today's rather fast variable contrast papers. If you want to change this, try a weaker/lower power bulb if you can find one (which will be difficult as you'd need something like a 25W bulb...)

 

This is true, assuming you don't change the lens.
With enlargers, it probably works best to use magnification as the important variable when you are evaluating brightness at the easel.
If possible, adding some sort of neutral density filter between the bulb and the negative is probably the best solution.

 

It looks like you did everything correctly and that 5 secs may indeed be correct for such a small print. 10x7cm is very small. If it is your intention to print that small for the foreseeable future then you might want to consider a smaller wattage bulb but if not then I'd stick with everything as it is. I'd not be concerned about lack of time for dodging and burning. Unless you have phenomenal skills at dodging and burning then 10x7cm prints will be nearly impossible to apply D&B successfully

The good news is that even 13x18cm prints will require considerably longer print times. Fred Picker's book is fine but it isn't going to help your problem here in my opinion

pentaxuser

 

If you are good with electrical wiring, you could wire a special enlarger socket that runs the electricity in series to a switchable light socket outside the darkroom. In that light socket you could put another 100W light bulb. Then when your enlarger is on, the specially wired socket will deliver reduced voltage to the light in the enlarger. If you short the outside socket, then all the electricity goes to the enlarger for when you need brighter light.

 

When I acquired a Beseler 45 MX it was doing the same. What I did was add a Resistrol with it which was hard to find. The control was really helpful for smaller prints. Now I mostly do 4x5 negs for lith printing so I am glad I have control over the strength of the light. I find the slow and low to work out great for getting the midtones on my printing.

 

Have you tried this yourself? Seems to me that you'd get two bulbs that barely glow by putting them in series; will there be any significant light output? If so, it will be lacking in blue.

 

You're right. I didn't think that all of the way through.

But I did have another idea, that would be fairly cheap, easy to do, but slightly annoying. You could install a high voltage, high amperage diode in series with the light bulb. That would act like a half wave rectifier (minus the smoothing capacitor) and cut the power in half. It would also cause the light bulb to flicker (the means by which it loses half it's power). But it would be effective and wouldn't cost you much or be too hard to build, and wouldn't change the color of the light. You'd just have to make sure you get a big enough diode to handle the load, solder it inline with the bulb somewhere, and wrap it in some shrink wrap or something so you don't accidentally expose yourself to line level voltage. Or better yet, install one into a cheap power strip, that way everything stays safely housed and you don't have to permanently alter your enlarger. Or house it all in a project box so you can install a switch to disconnect the diode so you don't have to deal with the flickering while focusing or figuring out your dodge or burn points...

This idea has gotten me excited! I might have to try it when I get some free time!

 

I think it would though. The warmup time of a bulb is somewhere around 20 ms.

 

Why not simply use a neutral density filter (or gel) to get longer exposure times where needed?

Mike

 

Yeah. I got carried away again. It's pretty much going to have the same effect as a dimmer switch. I'm not an incandescent light bulb expert, and am not familiar with their properties such as warm up times and what not, but I do know dimmer switches tend to warm the light as you dim the light, and they operate by cutting off part of the AC signal, so I would expect the diode to have a similar effect.

Boo! I guess I'm just having one of those days where my fingers are faster than my brain!

I probably shouldn't even mention my next idea of installing a small fan just off center of the enlarger lens and paint the blades black so that the bulb runs full time and the light is momentarily blocked by the blades. Of course, it's would have to be one of those fans where the blades are proportionally wider at the edge compared to the center so that you're not exposing one side of the image longer than the other due to the increase in proportional surface area as you extend beyond the pivoting center of the fan. It would probably just blow the paper around anyway.

 

I like your fan idea, very creative! Although an ND filter would probably be the easiest fix.

 

It's an idea I saw in a very old photo magazine. Even so, you are right, it will affect the color of the light which probably won't be very good - especially for multigrade papers.

I personally use an 0.60 Neutral Density filter (2 stops) to reduce intensity of my enlarger and if I were to buy another, I'd go for 0.90 (3 stops) because two stops is never enough.

 

reading the responses,you,ve got good advise so far, You are correct to question this.a more appropriate exposure time is around 20s for an 8x10 print 5s are to short to do any print manipulation.How did you determine your current exposure time and how is the contrast? a highe grade filter will need more exposure. Is the paper fresh or could it be fogged? Your dev concentration is unlikely the problem but throw in an ice cube or two and see if that helps.