Brightness of ground glass

[Doremus Scudder]

are you sure the gg is installed and not just a fresnel on it's own?

Good question. A photo of the set-up in action would help.

Doremus

[rdenney]

Many setups use a plastic fresnel sandwiched with ground glass. What you describe sounds like there is no fresnel, or the fresnel is not suited to this telephoto-design lens.

A tilting loupe will help, too.

If you like that focal length, keep on the lookout for a non-telephoto lens of that length. For example, Caltar marketed the 240 Type Y, which is a Rodenstock Ysarex of Tessar design. These are decent lenses that are not expensive. You’ll need more bellows draw, but you’ll have more movements.

Telephoto designs on view cameras were a compromise for cameras of limited bellows or bed length, like press cameras. You shouldn’t need it for your Omega.

Rick “doubting Omega supplied fresnels but not sure” Denney

[BrianShaw]

Rick “doubting Omega supplied fresnels but not sure” Denney

Surprisingly, they did... optional

[Doremus Scudder]

Rick makes a good point. If there is a Fresnel screen of a focal length not well-suited to the lens focal length, there would be a definite hot spot.

The OP, however, has what look like loading and bellows sag defects.

I'm waiting for photos of the negatives (on a light box or white computer screen) and of the ground glass with an image projected on it.

Those would help us get to the bottom of this.

Doremus

[monochromeFan]

ive had issues at home, spent a whole day getting screamed at because i dared CLEAN THE SILVER WARE DRAWER.

[BrianShaw]

Sorry to hear this and don’t think you are alone. Sometimes the most thoughtful acts can get misconstrued in a marriage. Whatever you do, don’t even think about rearranging the clothes in the closet.

[Kino]

Kino is right that we need more information. Kino is mistaken, however, that extending the bellows past infinity focus will reduce the image circle; just the opposite, extending the bellows increases image circle.

Doremus

Yes, I wasn't thinking too clear there. Anyway, be interested in hearing the final verdict.

[Drew Wiley]

Fresnels might help with wide angle lenses in dim light. But they can be counterproductive with longer lenses like a 240 for 4x5. I don't like them at all.

[Tin Can]

Ditto

and I have tried many

Horseman 8x10 even made it in front or rear

I have both

nobody believes me

FTW

[Vaughan]

schnieder tele-xenar 1:5.5 240mm lens

That lens has an image circle 141mm, will not cover 4x5 (152mm) at infinity.