You can check the quality of the developer in real time if you use this rule of thumb: Dektol @1:2 begins to produce mid-tones in 30 to 35 seconds. Develop exactly 4x the time it takes to see mid-tones. This will compensate for oxidation, temperature variation, sun spots and hangovers.
Originally Posted by ann
Tip 2: Stop down one stop on the enlarger lens and double the exposure time. This will increase accuracy and eliminate some effects of current fluctuation, bulb warm-up time and dodge-burn spasticity.