Sagar,
I agree with Aditya.
All Teleconverters lower the quality. Also, it is very important to start with the highest quality lens and slap a teleconverter on it. The teleconverters work the best with SLR lenses.
Canon's EF 1.4x II TC that I use is the best and the costliest. It costs about 300 USD ie. about 14k INR. Third party converters like Kenko etc cost much less. I would not spend the 10k on a converter. Rather save it for investing in a DSLR system.
In the film days, a 500mm lens used to work as a 500mm lens as there was no crop factor. People used to stalk, crawl, wait in a hide etc to move closer to birds or animals. In bird photography no lens is enough. Even people use a 1.4x TC with a 800mm f5.6 lens. So one has to use the camera and lens within its limits.
I would suggest you to learn the ropes with this camera. And when you are ready move in to the next level and get a DSLR.
Cheers,
Sabyasachi
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