Upgrading from a6300 to a7iii (Or maybe a7Riii?) and lenses

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dorsht Junior Member • Posts: 35
Upgrading from a6300 to a7iii (Or maybe a7Riii?) and lenses
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Hello,

currently I'm using Sony alpha 6300 with 10-18, 16-70 and 70-200 f/4.

Since I'm looking for better performance in low light conditions and during sunset and sunrise, when the light is limited when compared to daylight, probably the best option is upgrading to FF.

Since the 16-70 isn't suitable for full frame camera (I know that I can use It on crop mode, but I don't want to do so), I'm thinking about two options in my budget:

1. Sony 24-70 f/4

2. Tamron 28-75 f/2.8

Which of them is better?

I had good experience with Tamron in the past.

The 10-18 is also an APS-C lens, but I won't upgrade It now, in the future I'll buy Tamron 17-28 f/2.8 or Sony 16-35 f/4, since It can work on FF body on some ranges as I saw in youtube and some websites.

I'm mainly taking photos of airplanes, so I need fast and reliable autofocus system.

The autofocus system in the alpha 6300 doing pretty well for my usage. This is the main reason why I'm thinking about the alpha 7 mk3 and not the R model, since It has autofocus system with more focus points. The R model offers better resolution, which can help when I need to crop photos.

I'll also buy Sigma 100-400 for E mount, since 200mm (even on APS-C body) isn't enough for my usage.

So my main questions:

1. Would you buy the Tamron 28-75 f/2.8 or the Sony 24-70 f/4 and why?

2. Would you buy the alpha 7 mk3 or the alpha 7R mk3 for my usage and why?

Thanks!

 dorsht's gear list:dorsht's gear list
Canon SX220 HS Nikon 1 J1 Sony a6300 Nikon 1 Nikkor VR 10-30mm f/3.5-5.6 Nikon 1 Nikkor VR 30-110mm f/3.8-5.6 +3 more
Sigma 100-400mm F5-6.3 Sony a6300 Sony a7 III Sony a7R III Sony FE 24-70mm F4 OSS Tamron 28-75mm F2.8 III
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