what format...how much coverage? tele lenses do not take as much bellows, nikor makes them in 400 500 600 and 800...

do you need the lens to be in a shutter? also fugi has a compact 12.5 450 mm and a 600 mm but they are not tele designs and also would have to have 450 mm and 600 mm of bellows at infinity and much more for closer focus.....what specific use are you looking for? If landscape and you like the 24 inch lens then you are pretty much going to have to use 24 in of bellows for that perspective or get a 600 tele which uses less bellows....important however how much film do you have to cover?