FP4+ Personal Film Speed & Mamiya C330

Todd Barlow

Subscriber
Joined
Aug 9, 2004
Messages
507
Location
Ontario
Format
Multi Format
I am curious about how my personal film speed testing compares to others.

Lens: Black bodied Mamiya 80mm f2.8
Shutter Speed was tested and is acurate

Film: Ilford FP4+
Developer: Ilfotec DD-X
Time: 10m at 20C

My Personal Film Speed: 320
 

Roger Hicks

Member
Joined
May 17, 2006
Messages
4,895
Location
Northern Aqu
Format
35mm RF
Todd Barlow said:
I am curious about how my personal film speed testing compares to others.

Lens: Black bodied Mamiya 80mm f2.8
Shutter Speed was tested and is acurate

Film: Ilford FP4+
Developer: Ilfotec DD-X
Time: 10m at 20C

My Personal Film Speed: 320
Click to expand...

Interesting. Ilford's own figures suggest ISO 160+ in this dev and my experience supports that. Yours seems high but hey, don't knock it.

Effective shutter speeds vary with aperture (efficiency variations) but this doesn't help much.

What criterion are use using for speed? Is it 0,10 above fb+f or printable shadow detail (which could easily give you the extra stop)?

Thanks for the info.

Cheers,

R.
 

Richard Kelham

Member
Joined
Jan 3, 2006
Messages
249
Location
Norfolk, UK
Format
Multi Format
Assuming your aperture is accurate (have you tried other lenses?) I would then wonder about your meter/metering technique.

I give my FP4+ 10 minutes in DD-X and get the sort of negs I like rating the film at 125ISO...



Richard
 

paul ron

Member
Joined
Jan 22, 2004
Messages
2,706
Location
NYC
Format
Medium Format
In old cameras with shutters running a bit slow, testing is the best way to calibrate your equipemnt. Be sure to run the tests on your other lenses.

Results are what matters, not if you are the same as anyone else, it's all relative to what you are using and your style of shooting, metering habbits as well.
 
You must log in or register to reply here.
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…