F-stop test strips

Linda

A
Linda

  • 1
  • 1
  • 43
I want to join the Circus

A
I want to join the Circus

  • 1
  • 1
  • 63
Lith on Bromide

A
Lith on Bromide

  • 0
  • 0
  • 82
Stone monoliths

Stone monoliths

  • 3
  • 1
  • 146
Bottoms Up

A
Bottoms Up

  • 3
  • 0
  • 89

Recent Classifieds

Forum statistics

Threads
180,635
Messages
2,493,566
Members
95,120
Latest member
mkaelin
Recent bookmarks
0

wiseowl

Member
Joined
Sep 14, 2003
Messages
423
Location
S Wales
Shooter
4x5 Format
I want to start doing my test strips using the f-stop method. So far I'm able to work out 1/2 stop increments, not exactly difficult even for my poor maths ability. However this has been a little coarse and I think it would work even better if I used 1/4 or finer steps.

Is there a formula, or rule of thumb for calculating these small increments, or some other resource, such as a chart or table available? I know there is a timer which supports this feature but that is outside of my budget constraints, at least at the moment.

Cheers

Martin
 

JHannon

Member
Joined
Sep 7, 2002
Messages
969
Location
Boston, MA
Shooter
Multi Format
Here is a chart that may be helpful. It is in Adobe pdf format:

Dead Link Removed

Regards,
John
 

jpersson

Member
Joined
Feb 21, 2004
Messages
7
Location
Lund, Sweden
Shooter
Multi Format
I have a trick for 1/3 stops if you happen to forget your math and your charts. Look at the light meter ISO settings; ISO 100 for 1 second, ISO 125 for 1.25 seconds etc. It is not high math but it is close enough for me.
 

Eric_Fr

Member
Joined
Apr 27, 2004
Messages
5
Location
France
The formula is very simple :

n
Tb*2
with Tb : Base Time
n : Stop fraction ( -1, -1/12, ...,0, 1/12, +1)

Eric.
 
Joined
Jun 9, 2003
Messages
614
Location
Brazil
Shooter
35mm
There's one guy in the NET that made a freeware program for a Palm that will do that.
I've designed for him an interface so the Palm can control an enlarger.

I do not know his site, but if someone is interested, pls PM me and I will send his email.

Jorge O
 

GreyWolf

Member
Joined
Feb 10, 2003
Messages
166
Location
North of Cal
Here is another pdf chart that prints on a single piece of paper.

My f-stop chart

Kind Regards,
 

JHannon

Member
Joined
Sep 7, 2002
Messages
969
Location
Boston, MA
Shooter
Multi Format
It can't get any simpler than just printing out the chart. I used this until I bought a F-stop timer. Nice job on your chart GreyWolf..

John
 
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
Top Bottom