Wilt wrote in post #18225753
I just had chat with WHCC, and just like the other vendor I have used, if I had an image area of about 3000 x 10000 pixels, and wanted them to print it on a 20" x 30" standard size paper, they would prefer I fill in the top and bottom area with white (blank) and submit a 6660 x 10000 pixel file to them.
Wilt can you not get any panoramic aspect ratios from your lab? I ask because both of the Pro labs that I use, mostly DS Colour labs, but also Whitewall, both offer panoramic format prints. For example for C-Type prints from DSCL they offer prints up to 12" wide on the basic machines, so as standard you can order 24/30/32/34/36×12 prints, as well as 28×11. I'm pretty sure the 28×11 is also printed on 12" paper, and may or may not need cropping by you. I've had them do a 24×12 for me in the past, and it came out really well. The only problem is getting it framed, as it needs a custom frame/mat to look the best.
Personally I usually stick to 3:2 for my images if I am posting them online, but I am also happy to use other ratios, including custom ones if it makes sense. I usually print at 16×12, since I can get OK plain wood frames at 20×16 complete with a mat for 16×12 for only £7.50 each. They used to be glass fronted, but are now perspex. With the cheap frame, and the prints only costing £1.20 each, including our 20% VAT sales tax, plus £4.50 standard delivery, which is usually next day including saturdays, even on my disability benefit I can afford to have plenty of framed prints on the wall. For many of my aviation subjects I am often focal length limited, even at 600mm, I would need a 900mm lens to come close to filling the APS-C frame for a lot of my shots. So yes I do need to crop a lot of images.