Copal 0 shutter speed accuracy

[Tin Can]

Exactly

That is less than a 20% improvement

will it last

is it real

[Tin Can]

I will add this, to answer my own ?

I have many failed Copal 1, but no failed Copal 0 or 0.0

May as well add this question

In your experience do both Copal 0 and Copal 1 have similar life spans

or hours to rebuild

I have a choice coming up

anybody?

[Times2]

I measured it the same way I measured it before, with my iphone (and later my mac). I have chosen 1s to be my "victim" as its span is long enough for my iphone/mac to detect significant shifts.

Dear Tin, nothing lasts.

[Bernice Loui]

One second victim, how often will one second be used for film exposure.

Best to check each shutter speed for accuracy and consistency. Keep in mind the 20-30% timing tolerance for mechanical shutters.
Oh, example of why folks into LF should place a high value on shutter accuracy and consistency as this will go a long ways to reducing frustration with the burning of film and images made.


Bernice

I measured it the same way I measured it before, with my iphone (and later my mac). I have chosen 1s to be my "victim" as its span is long enough for my iphone/mac to detect significant shifts.

Dear Tin, nothing lasts.

[BrianShaw]

One second victim, how often will one second be used for film exposure.

Probably rarely... but that is a clear indicator that shutter service should seriously be considered.

[Tin Can]

I am happy with some shutters if T and B work

even more if sync works

[BrianShaw]

Yes, indubitably... depends upon individual needs.

[lassethomas]

I measured it the same way I measured it before, with my iphone (and later my mac). I have chosen 1s to be my "victim" as its span is long enough for my iphone/mac to detect significant shifts.

Depending on how shutters are constructed there is no way to extrapolate a one second measurement to faster times.
Speed is usually controlled by both a pallet and retard escapement mechanism but the pallet is only engaged for speeds somewhere around 1/15 and longer.
This means that shorter times can work well and the longer times might be off in the same shutter. A common problem often encountered.

So a 1 second measurement will tell you nothing about how the shutter functions for for example 1/30 or 1/125. The only way to know is to measure.

And contradictory to some other posters my experience is that audio will be good enough for most application up to 1/60.

[BrianShaw]

Very correct about no interpolation from slow to higher speeds. If the slow speed delay mechanism isn’t working correctly it always means that the shutter is dirty enough that it should be serviced… whether the higher speeds are “working acceptablely “ or not.

Same with self-timers, when they are present.

Both are harbingers of impending failure.

[Bernice Loui]

Sinar shutter has a single timing (escapement) mechanism with one adjustment. Runs from 1/60 to 8 seconds. Shutter time/speed overall is often ok when checked at the ends of it's shutter speed/time range.

Big Ilex shutters like the# 5 have a single single timing (escapement) mechanism.

Smaller (older think) Compur shutters have two timing (escapement) mechanisms and a extra high tension spring for the highest shutter speed.



Bernice