small exposure time for printing

Black Bull (2010)

A
Black Bull (2010)

  • 0
  • 0
  • 0
Liz-Lith.jpg

A
Liz-Lith.jpg

  • 3
  • 0
  • 99
Stray (2014)

H
Stray (2014)

  • 6
  • 2
  • 149
Time #2

Time #2

  • 1
  • 0
  • 87

Recent Classifieds

Forum statistics

Threads
181,871
Messages
2,516,435
Members
95,431
Latest member
coolzizi
Recent bookmarks
0

lovritos

Member
Joined
Jan 3, 2019
Messages
7
Location
greece
Shooter
35mm
hello there
i am new to the forum so i hope my thread is in the right place ;-)

i set up my darkroom for the first time. i prepared my chemicals and tried to make my first prints.
the thing is, that i get very small exposure time. i did my test print and the exposure i can get is 5sec, using the smallest apperture available on the lens (f/16) and a number 3 (out of 5) contrast filter.
is this supposed to be normal? (the negative is developed before on a lab and it looks correctly exposed).

does it have to do with the developer?
i use PQ universal. it says 1+9 for 5 litres, so i mixed 50ml of the condensed solution to prepare 500ml of working solution.
this seems right, isnt it?
maybe i mixed the developer wrong and created a very strong solution?
does the solution affect the exposure time needed or is irrelevant?
i am not really sure about the temperature since i tried to adjust room temp at 20 oC and work. you think a temperature mistake can cause the issue?

pelase let me know what you think and/or send me a link if a similar thread has been opened before.

thanx in advance
 

Ian Grant

Subscriber
Joined
Aug 2, 2004
Messages
22,335
Location
West Midland
Shooter
Multi Format
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
 

sterioma

Subscriber
Joined
Jan 9, 2004
Messages
511
Location
United Kingdom
Shooter
Medium Format
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.
 

jim10219

Member
Joined
Jun 15, 2017
Messages
1,635
Location
Oklahoma
Shooter
4x5 Format
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.
 

glbeas

Subscriber
Joined
Sep 25, 2002
Messages
3,865
Location
Marietta, Ga. USA
Shooter
Multi Format
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.
 

glbeas

Subscriber
Joined
Sep 25, 2002
Messages
3,865
Location
Marietta, Ga. USA
Shooter
Multi Format
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.

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.
 
OP
OP

lovritos

Member
Joined
Jan 3, 2019
Messages
7
Location
greece
Shooter
35mm
hello
thanx for all the info

the enlarger is meopta axomat 5 and the lamp says 230v,100w
you are right about the small print. i have some 20x25cm papers and no money at the time so i cut one in 4 pieces and try to print w/borders so the actual print is almost 10x7cm. the enlarger is at the lowest possible height. i guess i should look for a smaller lamp or neutral filters..
 
OP
OP

lovritos

Member
Joined
Jan 3, 2019
Messages
7
Location
greece
Shooter
35mm
thanx again for the info!
it may have been simple, but never crossed my mind ;-)
 

Peter Schrager

Subscriber
Joined
Jul 19, 2004
Messages
3,797
Location
fairfield co
Shooter
Large Format
Zone VI workshop book...by fred picker
Learn to make a proper negative and minimum time for maximum black with your enlarger
EASY AFTERWARDS
 

Saganich

Subscriber
Joined
Nov 21, 2004
Messages
997
Location
Brooklyn
Shooter
35mm RF
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.
 
Last edited:

koraks

Moderator
Joined
Nov 29, 2018
Messages
5,469
Location
Europe
Shooter
Multi Format
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...)
 

MattKing

Moderator
Moderator
Joined
Apr 24, 2005
Messages
41,508
Location
Delta, BC, Canada
Shooter
Multi Format
There is an inverse square relationship between distance and light intensity, so if your 2x closer the light intensity is 4x greater.
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.
 

pentaxuser

Subscriber
Joined
May 9, 2005
Messages
16,827
Location
Daventry, No
Shooter
35mm
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
 

Bill Burk

Subscriber
Joined
Feb 9, 2010
Messages
8,237
Shooter
4x5 Format
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.
 

Dennis S

Subscriber
Joined
Mar 16, 2008
Messages
1,697
Location
Vancouver B.C.
Shooter
Multi Format
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.
 
Last edited:

koraks

Moderator
Joined
Nov 29, 2018
Messages
5,469
Location
Europe
Shooter
Multi Format
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.
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.
 

jim10219

Member
Joined
Jun 15, 2017
Messages
1,635
Location
Oklahoma
Shooter
4x5 Format
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.
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!
 
Last edited:
OP
OP

lovritos

Member
Joined
Jan 3, 2019
Messages
7
Location
greece
Shooter
35mm
hey guys
thnx again, really happy to see so many and fast answers! seems you have somhting like a community here ;-)
i printed at 13x19cm and i had f/16 and 14sec exposure. i will think about getting a smaller lamp or an ND filter (not really sure which will be aesier to find) for bigger exposure bc i dont see my self printing bigger for now. but bigger exposure would be nice cause i would like to experiment a little with masks.
 

jim10219

Member
Joined
Jun 15, 2017
Messages
1,635
Location
Oklahoma
Shooter
4x5 Format
I think it would though. The warmup time of a bulb is somewhere around 20 ms.
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.
 
Last edited:

Bill Burk

Subscriber
Joined
Feb 9, 2010
Messages
8,237
Shooter
4x5 Format
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.
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.
 
Joined
Sep 19, 2003
Messages
13,156
Location
K,Germany
Shooter
Medium Format
hello there
i am new to the forum so i hope my thread is in the right place ;-)

i set up my darkroom for the first time. i prepared my chemicals and tried to make my first prints.
the thing is, that i get very small exposure time. i did my test print and the exposure i can get is 5sec, using the smallest apperture available on the lens (f/16) and a number 3 (out of 5) contrast filter.
is this supposed to be normal? (the negative is developed before on a lab and it looks correctly exposed).

does it have to do with the developer?
i use PQ universal. it says 1+9 for 5 litres, so i mixed 50ml of the condensed solution to prepare 500ml of working solution.
this seems right, isnt it?
maybe i mixed the developer wrong and created a very strong solution?
does the solution affect the exposure time needed or is irrelevant?
i am not really sure about the temperature since i tried to adjust room temp at 20 oC and work. you think a temperature mistake can cause the issue?

pelase let me know what you think and/or send me a link if a similar thread has been opened before.

thanx in advance
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.
 
Photrio.com contains affiliate links to products. We may receive a commission for purchases made through these links.
To read our full affiliate disclosure statement please click Here.

PHOTRIO PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Ilford ADOX Freestyle Photographic Stearman Press Weldon Color Lab Blue Moon Camera & Machine
Top Bottom