how to record a full image circle on 4x5

[hoffner]

hello,

I would like to record a full image circle on 4x5".
5x8 inch would be too complicated for me, I would like a way to make it work for 4x5.
Has somebody any idea or experience with this type of experiment?

[QUOTE=Emmanuel BIGLER;1133212
Hello from France
--

And now regarding the project of recording a full image circle delivered by a LF lens, another approach with a lens designed for the 4x5" format is to use 5x7" film like in this DIY project by Gilles Barbier.
[/QUOTE]

It pays to read the OP, Emmanuel.

[hoffner]

You can also physically vignette any lens by either adding a snoot, or even a piece of cut out cardboard to the front of your lens
Using a 5x7 camera adds loads of options of course.

You can vignette whatever lens at its rear end too...

[Emmanuel BIGLER]

It pays to read the OP, Emmanuel.

And since I had, of course, read what the OP said : Has somebody any idea or experience with this type of experiment? (now I'm definitely richer having being paid)

... simply have a look at Gilles Barbier's article and scale everything by a factor 0.7

[hoffner]

It pays to read the OP, Emmanuel.

And since I had, of course, read what the OP said : Has somebody any idea or experience with this type of experiment? (now I'm definitely richer having being paid)

... simply have a look at Gilles Barbier's article and scale everything by a factor 0.7

"This type of experiment" in your understanding pertains to 5x7 format which the OP expressly didn't wish? Strange. So why don't you explain now how you scale a 5x7 format and its lens "by a factor 0.7"?
Gilles' article I read - it didn't take long to see that he speaks about a format the OP didn't want to use. Étrange, n'est-ce pas?

[Carsten Wolff]

The 58mm Omegon may work (image circle about 100mm); You can also physically vignette any lens by either adding a snoot, or even a piece of cut out cardboard to the front of your lens
Using a 5x7 camera adds loads of options of course.

Update: I just tried a 75mm f2.9 Lens off an old Braun Paxina: Image circle 99mm wide open at infinity.

[Brian C. Miller]

Spiratone fisheye attachment.



I bought a Nikkor 150mm lens just for this lens attachment. The fisheye lens attachment comes with different adapters, but the only one that fit anything close to a common filter thread was the Nikkor.

And as everybody else said, use a lens for a smaller format. Note, though, that the circle of illumination may be larger than the rated format, so your mileage will definitely vary.