No 'Shift' lens for these !!

[pentaxpete]

Oh Dear -- converging verticals here but I'm not a 'PhotoShop' expert to straighten them !! 1986 LEICA M6 with outdated film in a cruise.
Interior, Navigator of the Seas, Royal Caribbean Ship -- 35mm f1.4 Summilux, 2006 dated Fuji NPS 160 rated 80 ASA

Cruise 02 by pentaxpete, on Flickr
Interior, Messina Church, Sicily Italy 35mm f1.4 Summilux at f1.4 and a flash, 2006 dated Fuji NPS 160 rated 80 ASA ,prints scanned

Cruise 04 by pentaxpete, on Flickr

 

[David A. Goldfarb]

Under the enlarger, you can make modest corrections by tilting the easel, and of course you can rotate the easel to straighten the "horizon." For a slight correction, this is often a good trick. Some enlargers also have tilting lens and film stages for even more flexibility in this regard, but ultimately, since the three-dimensional scene has already been converted into a two-dimensional image on film, the most you can do is to square one plane at one distance from the original camera lens, like using rear tilt/swing on a view camera. To correct all planes, you need rise/fall on the camera or a better place to stand.

 

[pentaxpete]

That's right - also not easy snatching photos in the Church when in a Group with a Tour Guide speaking and about to move off elsewhere !

 

[richard ide]

All you need is a rectifying enlarger. ;<)