I felt uncomfortable for the first time ever with this lens. Its awesome fast and sharp but wonder if the limited use will be worth tying up $7300. Any uses that would be helpful to try.
First - if you do not have one already - get a shoulder strap like the black rapid or equivalent which will make you feel much more mobile. Second, consider getting a monopod. Just to save you some weight compared to hand-holding it. I normally do not use any support, but after a skiing accident this Winter, I sometimes bring a tripod just to avoid over-exerting my still-healing arm.
For uses let me suggest:
- Wildlife - which surely is a reason people get this lens. Its far easier to lug around than the 400mm f/2.8 and takes a 1.4x really well. Go to the zoo and check it out one day!
- Its a sure hit for outdoor sports. Especially for action shots where people are moving towards/away from you. And your lens even has a special IS setting for these kinds of shots that works very well. I have taken lots of middle- and high school sports shots with a 300mm f/2.8.
- I use this lens primarily for street pictures. Not a lot of people do because its large, but to me the blur effect when shooting 300mm @ f/2.8 is just great to take away the often confusion and colourful city backdrops. Maybe a niche for you too?
- Shots covering different heights (hills, waves, rolling streets, stairs etc.) often benefit from the added compression effect of a semi-long lens.
- Water sports (at sea/ocean) is another perfect use; sailing, surfing etc. Reach is king here.
- If you are into details and abstracts you can use the ultra slim DOF and fairly long reach to take shots that others simply cannot- at least not with their iphones(!)
- Finally, take it to events such as music, open air shows etc. many people will actually give way to you and your lens as they ascertain you are shooting for a living and need the space (I don't misuse this myself, but the effect is clearly there). On the downside I understand that some events may not let you in with a big white because its a "pro" lens.
Hope you end up using it. The one thing you do not want is to have it lying around - in stead make someone else very happy with a (slightly) discounted private sale.