Widest lens on shen hao with 617 rollback?

[Momentz]

As the subject lines says, just wanting to know the widest lens you can use without getting vignetting, is it 72mm or 90mm?

[Gary Tarbert]

90mm and even then you will need too reccess the board.Cheers Gary

[Songyun]

I really don't think 45->617 is a good solution.(weight, vignetting) Go with 57 with a 617 back.

[Aender Brepsom]

For the occasional panorama shot, the combo 4x5 camera + 6x17 back suits my needs perfectly. I can also use the 90mm lens without vignetting, but I will try the 75mm with a 19mm recessed board soon. It may also depend on the minimal extension of your camera. An Ebony 45SW might work where a Shen Hao might not.

[Gary Tarbert]

90mm and even then you will need too reccess the board.Cheers GaryThe reason i said this is i use this very combo believe you me you don't want the 72mm on the 6x17.
Total W.O.T ,the reason i say this is 6x17 is a wide view of the world even with a 150mm lens.
The perfect combo for 6x17 IMHO is a focal length around 110mm for 6x17.
just my 2 cents worth .Cheers Gary

[Aender Brepsom]

You are right, Gary. For my taste, 90mm is very often too wide. I prefer the 150 mm, but I will try the 75 mm for very exceptional indoor shots. Even if it works, I am sure I won't use it more than twice a year.

[David A. Goldfarb]

I use the 75mm occasionally on 6x17 (DaYi back, Linhof Tech V). It's good to have the option. Here's a recent one--

http://www.echonyc.com/~goldfarb/temp/Spuyten%20Dyvil%20Bridge%20and%20Henry%20Hudson%20Bridge%20from%20InwoodHillPark,Sept2007.jpg

That's the Spuyten Dyvil train bridge on the left, open for boat traffic, and the Henry Hudson bridge on the right.

Lenses shorter than 72mm won't cover the format, and won't be able to focus to infinity with a 4x5/6x17 back, due to the offset built into the back.