I am considering purchasing a Caltar II - E 150mm lens for my toyo 45ax 4x5 fiel d camera. My question concerns the image cirle for this lens which is 180mm. Wil l this lens be limiting in terms of movements with my camera? Or should I perhap s look at spending some extra $ for a lens with larger coverage? I will primaril y be using the lens for landscapes. Responses would be greatly appreciated.