A24 or 24 film back How do I know what I am buying

[Gregarpp]

I am still a bit confused.

The guy I bought this from was positive it was a A24 film back. That meaning and auto film back.

But from what I was told earlier, the handles on this one are from the non A backs.

So whats the verdict? was the seller truthfull?

 

[hasselbladtech]

This film magazine is a Magazine 24, not an A-24. However, unlike the original Magazine 12, the film automatically stops winding when you reach the first frame.

When the chrome, flip-up film winder on this magazine was modified to the black, plastic winding crank, the designation was changed to A-24.

Because even this older Magazine 24 automatically stops winding the film when it reaches the first exposure, some people think it is an A-24. I don't believe that the sales person mislead you ... he or she probably does believe that it is an A-24 model.

Dave Odess

Factory trained Hasselblad technician

www.david-odess.com

 

[Gregarpp]

Is there a mechanical or operation difference between this back and a true A24 back?

 

[hasselbladtech]

When the Magazine 24 was discontinued with the introduction of the A-24, the only difference was that the chrome half-moon winding key was replaced with the black, plastic winding knob. In order to accomplish this change, a few minor parts in the film magazine were changed. However, for all practical purposes, there is no mechanical or operational differences between the two types of film magazines.

Dave Odess

Factory trained Hasselblad technician

www.david-odess.com

 

[markuspd]

Interesting back, I know this is an old thread but I think the button might be a counter reset switch.
With my similar back from around 57 you wind the film on while looking through the rear slot, then when you`ve advanced the film to the first frame, you turn the film advance backward till you hear a click which resets the counter to one.
Maybe your magazine does not have this reverse reset, I am guess the black button is a differnt variation on the reset for the counter.

 

[hasselbladtech]

The black button is a modification for double exposures that was invented by John Kovacs, a technician who used to work for Hasselblad. After you take the first exposure, you press the black button in, then wind the camera. Pressing the black button in prevents the film from advancing to the next frame.

David Odess

Factory trained Hasselblad technician

www.david-odess.com

 

[qnu]

John Kovacs? Or Ralf Frode?

 

[hasselbladtech]

John Kovacs received a patent for his double exposure modification from the United States patent office. It may be possible that someone else in another country came up with a different design for the modification and received a patent from another country; I don't know.

David Odess

Factory trained Hasselblad technician

www.david-odess.com

 

[qnu]

Yes, Hasselblad has this patented too.
But i see Kovacs was a little bit earlier, his patent being cited in that awarded to Hasselblad.

 

[jotloob]

Q.G.

I think , this should be passed on to Richard Nordin . I did not find anything about this "double exposure" button in the compendium and have never ever heard about it .

 

[qnu]

Jürgen,

I suspect this is not in the compendium because it was never a Hasselblad product. Never saw the light of day.
There are quite a few more things they thought about, designed, possibly even made prototypes of, which never made it out of the Hasselblad building, and consequently are not in any list of Hasselblad products.

Info about things like this (whether 'invented' by Hasselblad or somebody else) will eventually be published in one form or another. Just be patient.

 

[limnoguy]

>Quinten is correct (as he almost always is!). >There are many Hasselblad items that were made >by other manufacturers (teleconverters, polaroid >backs etc) that are not in the Compendium and >quite a number of prototypes and special order >items also left out due to lack of space (and >interest?).

 

[rcyoung]

> I have a radio control for the motor drive bodies (I use it on a > 553 ELX), that is labeled "Hasselblad" but I have not seen it in > any official listing. It uses a 27MHz range signal which I believe > is in the CB radio range here in the US. It is smaller than the > "official" radio control I have found listed in the Compendium > ( the receiver is about 1/2 the size of a carton of cigarettes, the > transmitter is about 6 in long with a single push button). Anyone > have any ideas as to its source??? Just curious as it still works > just fine.