Help: Wrong ISO

[Rob MacKillop]

I'm just back from a wonderful walk along the Almond River in Edinburgh, and managed to take what I hope are two rolls of good shots. We shall see. I took lots of readings with the Weston light meter, BUT I've only just realised that I forgot to set the ASA/ISO on the meter - so everything is out.

Meter: 400

SFX: 200 - red filter

FP4: 125 - yellow filter

Is there a big problem here? Will the developer be able to adjust?

 

[Pete Askew]

You will need to ask them to push process these films.

You exposed SFX at one f-stop over BUT you had a 3 f-stop filter factor. So effectively you have exposed it as if it was ISO 3200.

With the FP4, taking account of the under-exposure and filter (1 f-stop) you have exposed it it at ISO 800.

That is quite a lot of under-exposure but you will get something back by asking the lab to push-process based on those ISO settings. They will likely be very contrasty but at least you should get something.

 

[Dan Cattermole]

Top advice Pete, I couldn't of put that anywhere near as good as that.

 

[Rob MacKillop]

The Master is back! We've missed you, Pete! Thanks, yet again