Going from 70-300 to 100-400

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N4865G
N4865G Regular Member • Posts: 449
Going from 70-300 to 100-400

Good day,

I'm thinking about upgrading my current 70300 long zoom to the 100-400 GM one.
I normally shoot a lot of sports, wildlife and I do spot aircraft occasionally.
I am happy with the larger size and weight of the 100-400 but need to weigh the net quality increase I am going to achieve with this investment.

Extra 100mm would come as a bonus along with its ability to use the 1.5 converter.

For those of you who either have gone through this change or possibly have both lenses could you please let me have your feedback on the following:
- is the 100400 SIGNIFICANTLY sharper?
- does it focus at least as fast as the 70-300?

I am looking at achieving major step up in terms of picture quality with this change. My current 70-300 is a sharp copy of this lens.

Will I be disappointed?

Thank you very much indeed for your comments.
Dom

ttps://dbuszek.wixsite.com/photography

 N4865G's gear list:N4865G's gear list
Sony a7 III Sony FE 85mm F1.8 Sony FE 100-400mm F4.5-5.6 Venus Laowa 15mm F2 FE Zero-D Sony FE 24-105mm F4 +1 more
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