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Which T/C for my SAL70200G?

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Post Options Post Options   Quote Effstop Quote  Post ReplyReply Direct Link To This Post Topic: Which T/C for my SAL70200G?
    Posted: 23 February 2012 at 09:05
I'm a bit undecided. I have a SAL70200G inbound and have enough left over for one teleconverter. I already have the Sony 70-300G, which I'm very happy with, so have in mind to go for the 2x T/C to give me 400mm reach when required (airshows, wildlife etc). Some reviews say the 2x converter is a good bit of kit, some say it's too much of a compromise IQ & speed-wise and therefore the 1.4x is a better bet.    

Not sure, however, that the 1.4x wouldn't make my 70-300 G slightly redundant so would be interested in having the opinions & experience of members here.

I'm talking about getting a genuine Sony T/C here, not 3rd party.

all advice and opinions appreciated!

Cheers

Dave
Dynax7,a700,a55,a77+VG,CZ1680,85f14,135f18,SAL3514G,70200G,70400G,M24f28,35105,50f14,70210f4,100f28M,100f28SF,200f28G,500f8,Tok1116,TCs 1.4 & 2.0
 



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Jozioau View Drop Down
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Post Options Post Options   Quote Jozioau Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 09:49
In my experience using the SAL70200 with both the genuine SAL14TC and SAL20TC, I'd recommend you stick with the 1.4x teleconverter.
The SSM autofocus works surely, and the image quality remains very good indeed, especially if you stop down a little.
What you lose is the extra certainty and focus speed of the special cross sensor that is only activated with f2.8 or faster apertures.
I found that using the 2.0x teleconverter with this zoom lens deteriorates the image quality very markedly, and feel it is primarily useful with the G range of prime telephoto lenses, such as the Minolta 200mm f2.8 APO G, the Minolta and/or Sony 300mm f2.8 G (both of which I have used it with and got very good results) and presumably the 400mm and 600mm G lenses.
If the SAL70200 G plus SAL14TC means you're overlapping the SAL70300 G to a great extent that would free you up to sell it and put the proceeds towards your next bit of lens lust.
As you're in Melbourne, if you'd like to arrange to meet up and try before you buy and do some road testing with both these Sony teleconverters, drop me a PM and we can see if we can make it happen.
Joe
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Carl View Drop Down
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Post Options Post Options   Quote Carl Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 10:02
You could always sell the 70-300 and get both TCs.
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Post Options Post Options   Quote Effstop Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 10:08
Originally posted by Jozioau Jozioau wrote:


As you're in Melbourne, if you'd like to arrange to meet up and try before you buy and do some road testing with both these Sony teleconverters, drop me a PM and we can see if we can make it happen.
Joe


Thanks Joe, I appreciate the advice and the offer. When the lens arrives (delivery date unknown, guess Sony don't keep many in stock here!) I'll be in touch.

Cheers


Dave
Dynax7,a700,a55,a77+VG,CZ1680,85f14,135f18,SAL3514G,70200G,70400G,M24f28,35105,50f14,70210f4,100f28M,100f28SF,200f28G,500f8,Tok1116,TCs 1.4 & 2.0
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Post Options Post Options   Quote Iggy1965 Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 10:18
Hello Dave,

I own both the SAL70200G and the SAL 1.4 teleconverter. I have owned the SAL 2.0x TC.

The Sony 1.4x teleconverter is useable but not great on the SAL70200G.

The SAL 2.0x TC is a different story on the 70200G. I only used it when I really had no other options. IQ will degenerate a lot. I have sold the Sony TC 2x but decided to keep the Sony TC 1.4x

regards
Iggy
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Post Options Post Options   Quote vbpholaw Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 15:39
Generally speaking, 2x converters don't work well with zoom lenses, of any brand, including "matched" OEM converters. The exception might be the latest Canon and Nikon 70-200/2.8 lenses which seem to be a step up in quality from their predecessors and the Sony 70-200/2.8.

For the best optical quality, I would suggest sticking with the 1.4x, which will give you an additional one-stop over the 70-300 over most of the overlapping range (the 70-300 goes down to a maximum f:5.6 pretty quickly as you zoom in). There obviously is a big size and weight difference between the two lenses, so you might want to keep both for different situations (e.g., when you want to travel light vs. the wider maximum aperture). You also could do some comparisons of the two to see which provides the better image quality and then decide what you want to do.
 



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balacau View Drop Down
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Post Options Post Options   Quote balacau Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 15:46
On every TC discussion that I've ever seen, it appears that the 1.4x unit (regardless of manufacturer) is always better thought of than its 2x counterpart.

What's the deal with this?

Best regards

Gavin
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Serdar A View Drop Down
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Post Options Post Options   Quote Serdar A Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 15:50
Joe and Mark: Based on what you said, is it OK to assume that SAL-20TC is OK with 200/2.8G and 300/2.8G? Maybe not wide open, but stopped down slightly.
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Post Options Post Options   Quote romke Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 18:57
any TC will deteriorate IQ somewhat, and the larger the magnification, the worse it gets. that is not to say that they are not usable (certainly the 1.4 TC can be handy) but you will sacrifice some IQ. whether that is bad and shows up in the images when viewed from a normal distance is another matter. imo it depends very much on the shot taken, sometimes it is annoying and at other times there will be no problem.

a TC can be quite a useful (and small!) addition to your gear at times, but the very fact that it costs only a fraction of the lens you want to "elongate" with it, is a sure indication that somewhere else a price has to be paid.



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FineArt View Drop Down
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Post Options Post Options   Quote FineArt Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 20:39
I don't understand why you would want to buy 70-200G plus tele when you already have the 70-300G. What were you trying to do?
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Post Options Post Options   Quote Serdar A Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 20:57
Originally posted by FineArt FineArt wrote:

I don't understand why you would want to buy 70-200G plus tele when you already have the 70-300G. What were you trying to do?

He already bought the 70200G and inquiring about how it will perform with the SAL-20TC giving him a 140-400mm f/5.6 zoom. He will probably use it w/o the TC between 70-200 @ f/2.8 and with the TC between 200-400 @ f/5.6. Speed and range wise this makes the SAL-70300G he already owns redundant and probably could save a couple of hundred dollars if he sells the 70300G and buys a 2x TC. He is concerned that the resulting combo may not be as good IQ wise and asking people who have experience.

Now, do you understand what he is trying to do?
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Post Options Post Options   Quote eccles Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 21:02
Originally posted by balacau balacau wrote:

On every TC discussion that I've ever seen, it appears that the 1.4x unit (regardless of manufacturer) is always better thought of than its 2x counterpart.

What's the deal with this?

Best regards

Gavin


It's all a question of available resolution from the lens in front of it. In terms of area, a 2x TC magnifies the lens image by four times. In other words the lens must be capable of outresolving the sensor by a factor of four. This is a tall order for even the best prime lenses especially when used on the new high density 24MP APS-C sensor. Possibly the only Alpha mount lenses worth considering are the the 200mm and 300mm F2.8 primes.
A 1.4x TC *only* doubles the magnification amd many good zooms are capable of outresolving a sensor by a significant margin, such that a 1.4x TC can give quite a bit more detail than a crop.
As sensors have increased in pixel density the value of cropping has increased. I have Sony 1.4x and 2x TCs that I use with my Minolta 200mm F2.8 HSG, and while I've got good results with the 2x on the A77, I haven't actually got around to doing a detailed comparison between the two TCs. I suspect there is still a little extra detail to be had from the 200mm G with a 2x TC but it's not going to be double that from the 1.4x. I'll do some testing when the light gets better.
Mike.
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 22:38
With my copies of the 70200G and the 70300G I find that the 300 starts to get soft past 200mm and the 70200 gives a sharper image cropped to the 300mm FOV. That was on the a700, haven't compared them with the a77 yet but now I think I will do another tele-zoom comparo before the Spring shooting season starts up.
Rob Suits Jr.
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Post Options Post Options   Quote wetapunga Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2012 at 22:59
Well, I've owned both the 70-300 G, and now the 70-200 G, and of course, mucked about with TCs.

The 70-300 G is actually a nice zoom lens in its own right and at about half the weight and longer FL than the 70-200/2.8, it's a good option to have when weight's an issue.

In terms of TC's, I'm pretty reluctant to use them on a 70-200/2.8. I concur with Mark there- zooms don't match well with TCs.

Overall, the image-hit is subjective. You're going to take an IQ and peformance hit with a TC. For me, a 2x results in an unacceptable loss. A 1.4x, not that bad I won't employ them from time to time (but really, they're for my prime rather than the zoom).

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