Mu current Wisner 11x14 was purchased used with a rather short set of bellows. The was original owner ordered the bellows this way. Now I find that there are shots where some extra length is needed for tighter compositions. So here is the question. Is it possible to add about 18" of bellows on the front as an extension without interfering with the image? I am concerned that the extension may cause image cutoff. This may or may not be a valid concern. The other option would to have a longer set made. Any suggestions?