Rob de Loe wrote:

As wonderful as the GF 250mm seems to be, I'm hunting for a unicorn: an excellent but inexpensive, light weight 250-300mm lens with an image circle large enough to allow movements.

I've narrowed it down to two (plus one) candidates, and would appreciate experience-based advice on those from people who have used them on GFX. Other ideas are also welcome.

The two main candidates I'm thinking of are these:

The "plus one" option is the second generation SMC Pentax 67 200mm F4 matched with the 6x7 Rear Converter 1.4x teleconverter (for a focal length of 280mm). The combined weight is about the same as the A 300 lens, plus I'd have to buy a P67 to P645 adapter, so this doesn't seem like a great choice. The lens does have excellent feedback, and it would give me the option of 200mm and 280mm. But it's big and heavy.

I've ruled out the SMC Pentax-FA 645 150-300mm F5.6 ED [IF] because I've owned it already and while it's very decent, it's not quite as good as I want it, and it's bulkier than I like.

I'm not opposed to Mamiya (e.g., the Apo 200 f/2.8 with a teleconverter is an interesting option). However, anything other than Pentax 645 means I have to buy and carry additional tilt-shift adapters.

Thoughts? Ideas? Thanks in advance!