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a7Riv + 200-600 G + Teleconverters opinions .

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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Topic: a7Riv + 200-600 G + Teleconverters opinions .
    Posted: 03 February 2024 at 15:37
I'm just looking for anyone's opinions on using the Sony a7Riv with the Sony 200-600mm G and a teleconverter .

I tried my Sony A mount 70-400mm on the a7Riv via the LA-EA5 the other week at a nature reserve and was very unimpressed with the AF speed , my screw driven lenses seemed to perform much better with that combination .
It focusses much better on my a77ii and a99ii .

Now , despite deciding this year that I needed to sell on a load of unused gear and not buy more , after having a bottle of homebrewed Mead I bottled up in 2006 , I've just had delivered a good as new Sony 200-600mm G lens !

So much for thinning out my gear !

First try with it in my back garden and I'm happy I got it , very good AF speed , 600mm on a dull day , hand held , lovely sharp images .

I use teleconverters with my A mount 200mm , 300mm and 400mm G lenses . The 1.4x give spot on results , the 2x , less so .

Now I'm thinking small birds a way away or astrophotography , moon , sun and planets , a bit more than 600mm would be good .

For normal use , the 61mp of the a7Riv are excessive for me ( I bought that camera when I was looking at a full frame E mount when it was the only one compatible with the LA-EA5 ) , so if I put the camera in crop mode , the APS-C crop is 26mp (or so) effectively giving me a 900mm lens .
No loss of image quality as I'm just cropping , rather than adding extra glass .

But a 2x TC ?

A 1200mm lens would be handy . I don't think cropping a 600mm down is a satisfactory , but I'm wondering about my options .

600mm with a 1.4 TC in APS-C mode or 600mm with a 2x TC .
If I get a TC , I'll just be getting the one , and as they are on offer at the moment , I'm interested in one .
Has anyone here got first hand experience with both this lens and these teleconverters used with these high resolution cameras ?
a7Riii , a7Riv or a7Rv .

What are your thoughts . TIA , Neil .

EDIT , just to add , the way I read it , AF is retained with both these teleconverters , is that correct ?

see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
 



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Hezu View Drop Down
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Post Options Post Options   Quote Hezu Quote  Post ReplyReply Direct Link To This Post Posted: 03 February 2024 at 16:39
I have both 1.4 and 2 teleconverters for E mount and have used these with Sony FE 200-600 G. The camera used has mainly been α1, although 1.4 I did use also with α7R IV before I got the newer camera. The 2 I have got much later (October 2022), so I haven't used it as much. And lately I haven't used either teleconverter that often. But at times, when you absolutely want photos of distant subjects, these can be nice addition. AF works ok with these, although I do have hunch that I may have got little more missfocused images with shots taken with a teleconverter.
Perhaps the worst thing with combining a teleconverter and a slow zoom is that the aperture gets quickly slow: 200-600G + 1.4 TC is f/9 (in tele end) and with 2 TC it is already f/13, so not very useful for low light situations. Images taken with teleconverters may also look tad less sharp, but in general I think the results are still acceptable (especially with 1.4).
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 03 February 2024 at 17:33
I use the 1.4x with the 200-600 on my A7RIV.

E-mount camera will focus at any aperture, but their phase-detection won't work beyond some aperture. The A7RIV phase-detect is limited to f/11, so the 2X TC will kill phase-detection at the long end:

Sony's Compatibility website says for A7RIV + SEL20TC + SEL200600G:

"Focal plane phase detection AF cannot be used for focal lengths with a maximum aperture value of F13 or above, so contrast AF will operate."

The A7RV and A7CR don't have this note for the SEL20TC + SEL200600G.

Teleconverters have variable alignment like other lenses.      

Edited by QuietOC - 03 February 2024 at 17:41
Sony A7RIV LA-EA5
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2024 at 02:39
Thanks for both you reply's .
Especially on the back of the lens not using PDAF with the 2x TC I've decided to go for the 1.4 TC .
There currently available to buy new for less than they are second hand from LCE , so nothing to lose if I decide not to keep it .
https://www.lcegroup.co.uk/New/sony-fe-14x-teleconverter-lens_10887.html Same goes for the 2x TC's .

Type in "SONYWILDLIFE " for a £200 discount .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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