I have been curious about this for a while I and I was hoping that I could start a conversation about this to find some clear explanations. What size lenses can you effectively work with on 4x5 cameras, specifically Speed Graphic and similar brand press cameras. I understand that most 4x5 Speed Graphics came coupled with 135mm lenses and some used 127mm lenses in some cases, the latter being less effective with movements as I understand it but still effective at covering 4x5. What would be the reason for choosing one over the other? Also, I understand that the 3 1/4 x 4 1/4 Speed Graphics usually came with 127mm lenses. Can you use larger 135mm lenses with them to achieve the same end? What differences would you find between the lenses on this camera? Further, I have done a lot of reading about cameras modified to accommodate very large lenses and other specialty lenses that otherwise are not explicitly designed to be used with the cameras they are attached to. Some examples include the "Speed Aero" Speed Graphic press camera coupled with Kodak Aero Ektar 7in f2.5 lens, the Aldis Speed Graphic combo which features a Speed Graphic with a Aldis 7in f3.4 lens (both can be seen here), and there are many other hybrids I've read about. What are the explicit purposes of using these lenses on a press camera? What happens with the image that you are making when you use a drastically oversized lens in these circumstances? I would love to come to a better understanding of what effects using over and undersized sized lenses, as well as just using lenses of different sizes then come standard on press cameras and other 4x5's will have on photograph making. Thanks in advance for your help!