Hi there,
It is just a question of experience - the negative is perfectly printable but you need to have developed a range of skills to achieve this. However, do not despair, with time you can master such negatives and, in doing so, will have built up your knowledge and skills base ready for other difficult negatives in the future.
So how to proceed?
Firstly, a common mistake that people make is to just try and burn in the sky (with or without a mask) and this leads - in varying degrees - to the buildings in the sky getting too dark and the tonal balance of the print looks wrong.
It is far better to use a combination of dodging and burning. So if the correct exposure for the building is say 10 seconds and the correct exposure for the sky is 20 seconds you should do the following:
Give the whole print an exposure of 15 seconds BUT make sure the you dodge the buildings for 5 seconds. You could try and do them all at once but it is more effective to divide the area containing the buildings in to three areas and then dodge these areas in turn (keeping the dodger constantly moving):
So set the timer for 15 seconds and then dodge area 1 for 5 seconds, then move straight to area 2 for 5 seconds, then move straight to area 3 for 5 seconds.
Now set your timer for 5 seconds and concentrate on burning in just the sky (making sure you keep the piece of card or mask moving consistently).
This will work in many cases but if the sky is just that bit too dense it may not get you to the final print that you want to achieve. In this case you can use the selective pre-flash technique.
In normal use, pre-flashing the whole print is done to achieve a subtle reduction in contrast by ‘helping’ the highlights get ‘a flying start’. ???? - Just to explain (and you do not need to understand this as, by doing some pre-flashing tests, you will see the effect in practical terms - so you can SKIP this paragraph and go on to the next if you wish) a paper has an inertia factor when exposed to light (think of how difficult it is too start pushing a car but how, once it is rolling along the flat, only one person is needed to keep it rolling). This inertia effect means that the silver in the paper only starts to react after it has received a certain amount of light. Obviously, the shadow areas receive more light quicker that the highlights so if we can help the highlights by giving them a bit of extra light it will boost how quickly they react to light and will respond quicker thereby revealing more of the details that they contain.
In practical terms you just need to do the following:
- Get a piece of thin opaque perspex (or similar such as opaque ground glass) that is at least four times bigger than the diameter of the front element of your enlarging lens (bigger is better as it is easier to work with).
- Place a test strip on the easel, lay a pencil or pen along the centre.
- Without removing your negative, hold the perspex directly under the lens and do a series of exposures onto the test strip.
- Process as usual and make sure the print is dry before assessing it.
- Find the time where you can see a very feint grey tone in comparison to the white created by the pencil blocking all the light.
- The correct pre-flash time is the exposure directly before the exposure that produced the feint grey.
- So, if you exposed the test strip in 3 second intervals (i.e 3, 6, 9, 12, 15, 18, 21 seconds) and the 12 second exposure created the feint grey your pre-flash time will be 9 seconds.
Now for the final print:
- Pre-flash JUST the sky area making sure that you are constantly moving your piece of card (this will ensure that just the sky area is getting the ‘helping hand’ of a bit more exposure)
- Now expose for 15 seconds dodging areas 1, 2 & 3 as previously explained.
- Now burn in the sky for 5 seconds.
- Process as normal.
If any of this is not clear, please do not hesitate to ask.
have fun!
Bests,
David.
www.dsallen.de