From Winsome Technologies:
PDF to Image is an application to batch convert thousands of PDF files into other image formats in minutes. It's powerful yet simple and extremely easy to use interface to convert multi-page PDF into multi-page TIFF or single page various image formats in few clicks only. User can convert PDF into various image formats, like jpg, jpeg, png, bmp, gif, emf, wmf and tiff. User can convert PDF to one multi-page TIFF or multiple single-page TIFF. Along with the conversion, you can even change the image settings as per the output option selected.
I have converted several PDF files into tiff till now and didn't had single problem with it. Software totally satisfies my needs and probably the best part is that I don't have to spend any time learning it.