ULF 7X17 What size Dark Cloth? What type? I'm new to daylight...

[Tin Can]

Whew! Not the ones I've seen!

Maybe you could post a picture of the back of yours, Randy. My curiosity is piqued.

Will, in the 1915 Korona brochure http://piercevaubel.com/cam/catalogs...ndmanlp482.htm they brag of this proprietary design...I think it really works.

[William Whitaker]

That's what I expected to see, Randy, and it's what I've encountered before. You can't convince me that two short springs at the center of the back can provide even (or adequate) pressure along the length of a 7x17 film holder.

I don't mean to belittle your camera at all. As I indicated before, Koronas are nice cameras. However, I disagree with their engineers and marketing department on the effectiveness of short springs at the midpoint, especially on a banquet (panoramic) format where there is a long moment arm acting against them. I believe that four independent springs, preferably with overleaves will provide much more even pressure and be less susceptible to unintentional displacement while removing or replacing a dark slide. I have replaced these springs more than once. However, YMMV, and I hope it does. No insult or disrespect intended!

[Tin Can]

That's what I expected to see, Randy, and it's what I've encountered before. You can't convince me that two short springs at the center of the back can provide even (or adequate) pressure along the length of a 7x17 film holder.

I don't mean to belittle your camera at all. As I indicated before, Koronas are nice cameras. However, I disagree with their engineers and marketing department on the effectiveness of short springs at the midpoint, especially on a banquet (panoramic) format where there is a long moment arm acting against them. I believe that four independent springs, preferably with overleaves will provide much more even pressure and be less susceptible to unintentional displacement while removing or replacing a dark slide. I have replaced these springs more than once. However, YMMV, and I hope it does. No insult or disrespect intended!

No worries, I didn't design it, but I will battle test it.

And I will tell the story.

[William Whitaker]

I'm sure you will Randy... If I can be of assistance, do let me know.

[Tin Can]

I'm sure you will Randy... If I can be of assistance, do let me know.

Thanks Will!

[Lachlan 717]

The back on my Korona seems to hold it well.

I've got 'Dorff-style on my new DIY 7x17 as they're easy to make (relative!) If I could get my head around a bail arm, I'd include it to allow a higher tensile force. I'll see how the current one goes.

[Doug Howk]

My Korona seems to be of same vintage as yours, Randy. Smooth operating with center springs. I have had an occasional light leak, but now always leave darkclothe draped over back while shooting.
I have a wind stabilizer from AWB that gets some occasional use especially with a longer lens. Might be useful in the Windy City.

[John Jarosz]

I wish the website showed ULF applications.

He may have some pics he could send you. I've had mine for so long I've forgotten. He's very helpful. If you ask him I'm sure he can give you some additional info.

[Tin Can]

The Harrison Large Dark Cloth arrived. Very nicely made. There is no way I could have made one as nice, with all the velcro, waterproof material, and this lightweight for anything like the price of this.

It has velcro on 2 complete sides, which works great to surround the bellows and seal the bottom. Nobody told me how well it works or how it works. Not B&H, not here and not eBay.

Here it is engulfing my 8x10 Linhof.

This is a great product.

[Lachlan 717]

They do make good gear!!