100-400 paired with A9/1.4x TE or A7IV in crop mode?

Started 3 months ago | Discussions thread
OP Geekapoo Senior Member • Posts: 2,584
Re: 100-400 paired with A9/1.4x TE or A7IV in crop mode?

rgwaller1 wrote:

As an owner of both the A9 and A7RIV plus the 100-400 GM, 200-600G and Sigma 100-400 DG E mount I may be able to help. After having a stroke that affected my right side I found that when using the 200-600 for my BIF's after a short time I was not keeping up with the birds and missed many shots because of the weight. I have pretty much put that lens out to pasture unless I will be doing mostly static subjects. Both the Sony and Sigma 100-400 are great lenses on either the A9 or A7RIV and I do not get as tired when shooting. I prefer the A7RIV over the A9 for being able to crop the shot more and have better resolution. The AF on the A7RIV is fast and accurate in my use. Another thing you may want to consider is using the E 70-350G in combination with the A7RIV ( 105-525mm and 26mp). I use this combo when wanting to go really light and its works great with sharp photos and fast AF. Just a thought.

Great pics and thanks for your suggestions. Sorry to hear about the stroke and hope you are back to (or close to) 100%.

I've looked into the Sigma 100-400 lens a little bit. Appreciate that it is a little lighter than the Sony but the key downside (at least for now) is not having the 1.4xTE option (I'd really like to be able to go >600). Also, the Sony lens is a little bit brighter and there are reports that the AF is better. For me, the money difference is not a big driver re my decision..but AF is, especially if going the route of the A7RIV instead of the A9.

Might consider the 70-350 if/when my the pinched nerve issue flares up (or just chronically gets worse) but for now the plan is to rely solely on the RX10IV (if possible) if I have a bad flare up.

What's your take on the AF difference between the two 100-400 lenses?

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Sony RX100 Fujifilm XF 16mm F1.4 R WR Sony RX10 IV Fujifilm X-T3 Sony a7R IV +11 more
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