DavorKondenar
Does anyone know the development times for
push processing
Efke (ADOX CHS) 100 €[font=tahoma,geneva,sans-serif[size=4]higher speed [/size]
Efke (ADOX CHS) 50 € [font=tahoma,geneva,sans-seri[size=4]higher speed [/size]
Efke (ADOX CHS) 25 € [font=tahoma,geneva,sans-seri[size=4]higher speed [/size] ?
I have ILFORD MICROPHEN and ID - 11.
Best regards
Davor Kondenar
TR
Hello Davor. Generally speaking, the speed of a film cannot be ‘increased’ by a developer. Only Microphen is capable, to put it simply, of ‘getting more out’ of the latent image. ‘Pushing’ simply means boosting the mid-tones and highlights, or increasing the contrast. Your shadows will usually have little or no detail.
DavorKondenar
[size=4]"The speed of black-and-white films can be utilised to a greater extent by extending the development time by 2–3 f-stops. However, the following should be noted:[/size][size=4]
[size=4]The extended development time primarily results in higher contrast and granularity. The achievable [/size][size=4]sensitivity utilisation depends largely on the subject contrast.[/size][size=4]It is therefore important that all parameters (contrast, granularity and speed) [/size][size="1"][size="1"][size=4]are optimally balanced as far as possible, i.e. the speed utilisation should[/size][/size][/size]
[size="1"][size="1"][size=4]as high as possible, the granularity as low as possible and the contrast not too steep." Quote from Tetenal.[/size][/size][/size]
[size="1"][size="1"][size=4] Regards[/size][/size][/size]
[size="1"][size="1"][size=4] Davor [/size][/size][/size]
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piu58
> Put simply, only Microphen is capable of ‘bringing out’ more of the latent image.
This applies not only to Microphen, but to all phenidone-based developers (phenidone and its derivatives). Gain of approx. 1/3 stop.
HenningH
My completely unscientific experience is that the 25-speed film worked well with an ISO of 40 and the 50-speed film with an ISO of 80 during exposure. I mainly used A49 and D-76 as developers, but HC-110 worked as well.
(This refers to the last batches, which still had the coloured backing.)
Wolf_XL
...I just don't see the point in pushing a 25 or 50 if I can simply buy a 50 or 100... The film manufacturers must surely have had a reason for selling film in a particular speed range.
You can look at it any way you like – ‘pushing without regret’ is like ‘losing weight without starving’... ;-)
piu58
> "Working out hard without any regrets" is like "losing weight without starving yourself".
The latter is possible. After a few weeks of a strict diet, you’re no longer hungry because your body has long since switched to burning fat for energy.
But working out hard without losing muscle mass is an illusion.
