MEDIUM FORMAT FOCAL PLANE SHUTTERS

by Sam Sherman flexaret@sprynet.com 1-28-2001

To realize just how good Bronica C, S2 and S2A cameras and their focal plane shutters are (in good condition cameras)- one has only to look at the competition:

KIEV 88

I was actively trying to import and market these cameras over 10 years ago. We had many defectives and the factory was not easy to deal with on repairs and make goods. We analyzed the problem mainly due to the metal focal plane shutter curtains, which each took a 90 degrees turn in order to wind or release. This put too much strain on the wind and other gearing. I suggested then that the factory replace the metal curtains with standard cloth curtains.

Since my old idea is now an option - there must be really something wrong with the metal curtains as we discovered.

This considering that the Kiev 88 has no instant return mirror and it is possible with the mirror up to have sunlight burn a hole in the cloth curtains (this is where the metal curtains are superior - as in old Contax rangefinder cameras with metal curtains vs. Leica with cloth curtains). I know one can burn a hole in cloth curtains with the mirror up as I did this to a Pentacon 6 many years ago in the California desert.

HASSELBLAD

Now continuing the above- It appears that Hasselblad also has a problem with metal shutter curtains and will no longer replace them on older 2000F series models. The more current 200 series ( an evolution of the 2000 series) now comes with CLOTH shutter curtains - which I have read cannot fit the 2000 series cameras.

Aren't these companies all moving backwards to where Broncia models C, S2 and S2A were working properly with cloth curtains all along? And since the Bronica cameras have instant return mirrors, burning holes in the shutter curtains is unlikely to happen.

- Sam Sherman


[Ed. note: see Unfixable Pro Cameras for more on the problems with Hasselblad 200/x shutter repairs, and Kiev 88 Pages and the Kiev-88 Mailing List for more on the Kiev camera shutter selection problems.]


Related Postings

From Bronica Mailing List:
Date: Mon, 29 Jan 2001
From: kelvin kelvinlee@pacific.net.sg
Subject: Re: Bronica Lists and Focal Plane Shutters

>Aren't these companies all moving backwards to where Broncia models C, S2
>and S2A were working properly with cloth
>curtains all along?  And since the Bronica cameras have instant return
>mirrors, burning holes in the shutter
>curtains is unlikely to happen.
>
>- Sam Sherman

Hi Sam

What's the condition of the cloth shutters after 30 years from C,S2 etc. which have not gone through servicing? am curious how they age.


From Bronica Mailing List;
Date: Mon, 29 Jan 2001
From: flexaret@sprynet.com
Subject: Re: Bronica Lists and Focal Plane Shutters

Kelvin,

All of the shutter curtains in my old Bronica cameras are in excellent condition, as follows:

Bronica Deluxe (1959)
Bronica C (1965)
Bronica S2 (1966)
Bronica S2A (1970)

The above dates are approximate, but considering how old they are all of the curtains are fine.

The S2A has a shinier type of material than the earlier curtains and looks more silk-like, This camera looks like new and seemed to have never been used when I got it last year.

When I was a kid I got a Praktiflex II, my first SLR, and I was not happy that it had fabric shutter curtains. I still have that camera over 40 years later and the curtains are still fine.

When I read that Rangefinder Contax cameras had metal curtains I thought that was the only way to go, and later on was very pleased when the Copal and Seiko metal focal plane shutters came on the market.

However, after all of my years of taking pictures with cameras with fabric curtains, I only have the following to report.

Yes, old 35MM Exaktas from the mid 1950s sometimes developed hard, dried rubber curtains which eventually were pinholed and I had those curtains replaced. The same goes for old Korelle Reflex and Master Reflex. Old Primarflex cameras (from the early 50s) sometime had curtains which dried out when the 1936 models had curtains still good (same for 1935 Exakta). I also mentioned that on a camera without an instant return mirror to block sunlight, I did burn a hole in a fabric curtain in a Pentacon 6 with a 180MM Zeiss Sonnar lens, out in the California desert. If I had kept that camera wound with the mirror down I guess nothing bad would have happened. (Advice for Pentacon 6, Exakta 66 and Kiev 88 - cloth curtain users).

As for old Bronica cameras, the instant return mirror blocks any sunlight from burning the shutter. I have no shutter curtain problems with these cameras and of the many I have examined through the years, the curtains were always okay.I am just now examining an old Bronica S, junker/parts body in terrible shape and the curtains are pinhole free and nice and pliable.

I think my concerns about fabric curtains are overstated as my history with them in Bronica at least is very good.

- Sam