do you think the extender like this https://photography-on-the.net …372794&highlight=extender will bump the focal length up enough?
- a 1.4x TC will multiple your focal length by 1.4x, but cost you a stop of light (so if you were shooting at f2.8, you are now shooting at f4), DOF, and a bit of IQ hit
- a 2x TC will multiple your focal length by 2x, but cost you 2 stops of light (so if you were shooting at f2.8, you are now shooting at f5.6), even more DOF, and more of an IQ hit
Due to the light stoppage, you will need to compensate with lower shutter or higher ISO to shoot the same material at the same exposure as without the TC, but you get more reach with a bit less IQ. It's all about tradeoffs, money, reach, light, and IQ. 

















