Olympus Af10 super and dx coding...

[IngMacca]

Anyone experienced in that topic?
I'm getting mad with DX coding..

 

[pdeeh]

dx coding is dx coding.
the camera doesn't matter.
get your sellotape and aluminium foil out and you're good to go surely?

 

[IngMacca]

My doubt it's not about coding.
Referring to wikipedia page:

https://en.wikipedia.org/wiki/DX_encoding

My camera has contact pins in position G, L2, L3.
The manual says it spans from 50 to 1600 iso, but in this way, referring to the positions it senses,
the interpretation of the code is not unique

 

[AgX]

There are at least 4 models of Olympus AF-10 cameras.

Likely you got the wrong manual. And your model just differs between 2 film lengths and nothing more.

 

[IngMacca]

Mine is this: (super version)

http://www.butkus.org/chinon/olympus/olympus_af-10_super/olympus_af-10_super.htm

with the manual

 

[AgX]

I see.

But you stated yours having 3 contacts, the manual shows 4. Another discrepancy.

 

[AgX]

If you look at the DX camera-coding system you will see that with 4 contacts basic film speed information can be achieved.

 

[IngMacca]

The point is that if I look inside the back of the camera where the film should be put it i can see only 3 contatcs

 

[AgX]

Once I found my sample of AF-10 Super I shall check.
I assume the majority of all cameras that got DX-coding only got 4 contacts.
But 3 does not make sense to me.

 

[IngMacca]

Once I found my sample of AF-10 Super I shall check.
I assume the majority of all cameras that got DX-coding only got 4 contacts.
But 3 does not make sense to me.

I agree with you. This evening I'll post a photo of the contacts

 

[IngMacca]

Here is a picture of the back of my Olympus.
I also placed a dx coding near the contacts to better show the position of the pins.

Thanks!

 

[AgX]

now it reads films with DIN speeds of

15-20
21-26
27-32
33-38

as groups.

Likely one contact has left the camera. It makes no sense to me saving on it.

 

[IngMacca]

My camera is not broken (one contact gone) because looking on the net I found other cameras of the same model made exactly the same.

 

[AgX]

But why? Add one contact and gain groups half that large.
(Of course one could also ask in the case of 4 contacts."Why not use 6?")


I admit I never bothered much with DX camera-coding. ("I assume the majority of all cameras that got DX-coding only got 4 contacts.").
I shall have a look in the future at my collection on this aspect.

 

[IngMacca]

Why is a good question But I think the only possible explanation is grouping as you told before

 

[AgX]

Anyone experienced in that topic?

Now it is time for that person to chime in.

 

[IngMacca]

So to summarize what we got from this fruitful discussion:

The camera detects and groups this ISO ranges:

25 - 80 (and the manual says that if a non coded-film is insered it works at 50 iso)
100 - 320 (and the manual says that 100 iso is an "actual setting point")
400 - 1250 (and the manuas says 400 iso as "actual setting point")
1600 - 5000 (and the manual says nothing...)

The only aspect that hurts me a little bit is that the camera seems to "make an approximation of iso speed"
This means that, for instance, I buy a 800 ISO film the camera exposes it for 400 ISO.
So later i shoud develop it for 400 iso...

 

[IngMacca]

Small new help needed about dx encoding:

I have a lot of fomapan film (I like them a lot!) that are without any dx encoding.
Has anyone accurate information about coding positioning on the film tank?
I don't have any other film dx coded so I don't know where to exactly stick my coding...

 

[AgX]

If you lay the cassette down on a table with the slit resting at the table, the lower end of the 2nd row is located precicely at the top.
The rest of the coding being directed towards the slit.
The width of the coding is symmetrically positioned between the flanges of the cassette.

 

[Bill Burk]

This is fun deciphering...

So the camera sees 50 - 80 as a group, probably exposes as 50.

It sees 100 - 320 as a group... probably figures you have 100, 125 or 200 and exposes as 100.

Then 400 - 1250 as the next group, probably exposes as 400...

Then if there's no contact, it treats it as 1600.

 

[Bill Burk]

You should use speeds of 50, 100, 400 or 1600 only.

But if you want to use other speeds, now you know the camera will treat it like one of those.

 

[IngMacca]

If there's no contact, it treats as 50.

 

[ic-racer]

The manual gives the answer. Only DX coded films of ISO 50, 100, 400, and 800 code correctly. Is there some other question?

PS: Be glad this is not an APS camera! You are so far ahead.

 

[AgX]

It does not read them correctly.
See posts #12 and #17.

I have not yet checked my collection on it, but from memory (well...) I have not come across any other camera with only 3 contacts.

 

[Bill Burk]

If there's no contact, it treats as 50.

You are right, the grouping is the same... but I see it now...

On the Wikipedia, and on a sample of film I checked... the "black" squares are black paint. So...
No contact is 50... contacts between ground and the third and fourth pin is 1600

Then if there's no contact, it treats it as 1600.

So I was wrong on this.