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Experiences with G zoom lenses on Alpha 700.

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MichelvA View Drop Down
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Post Options Post Options   Quote MichelvA Quote  Post ReplyReply Direct Link To This Post Topic: Experiences with G zoom lenses on Alpha 700.
    Posted: 16 May 2008 at 20:39
On the German SonyUserForum there seems to be a few people who have less than good experiences with the Minolta 28-70 f/2.8 G on the Alpha 700 body (most foggy/soft photo's at f/2.8, usually -almost- gone with smaller apertures. Some even sold their lens and went for the 16-80 CZ or 24-70 CZ.
One just reported a problem with a 17-35 f/3.5 G on the same body (a green circle in the middle with very small apertures).
I checked the lens reports; for the 28-70 G i counted 7 users who use this lens on the 700.
Now i am very curious if this is a common problem and what could cause this. I think it has to do with reflections on the CMOS sensor because many Alpha 100 users have good experiences with this lens.
But maybe someone can throw a better light on this..?
Reason for the question is that i had planned to buy a 28-70 and a 700 later on.
Any reactions of people with a 350 and use one of these lenses are welcome too!
 



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Octupi View Drop Down
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Post Options Post Options   Quote Octupi Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2008 at 21:15
I don't have the 24-70G but I did try three used ones this past January. I was considering a purchase, but all three produced very soft results on my a700 at 2.8, at iso 200. Therefore I passed on them.

I'm happy w/ my Tam 28-75 2.8 and have settled that I will keep it until I can get the CZ as I find it extremely sharp.
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Post Options Post Options   Quote wimski99 Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2008 at 21:15
Hmmm... My 28-70G was just shipped a few days ago (not received yet) and I was also planning to buy the A700 while there is only cashback until the end of the month.

Anyway, I had the opportunity to test the A300 for a few days and came to the conclusion that it is not a real alternative for the A700 in terms of AF-performance.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2008 at 21:25
In the thread on SonyUserForum.de on the 17-35G you probably noticed that several 17-35G users reported NOT having the problem. For instance Ray9 mentions he is happy with both the 17-35G and 28-70G on the A700. (though he also mentions sub-par performance at 2.8)

But on the other hand, some people have problems with this combination. So, I think the best solution is simply test your versions. (the problem might not even be the lens, but sensorreflections on some A700's....). I'm waiting for the A900, their these G's will shine

Edited by addy landzaat - 16 May 2008 at 21:26
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MichelvA View Drop Down
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Post Options Post Options   Quote MichelvA Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2008 at 21:31
Yes, the 24-70 CZ seems sharp, but i have read the bokeh isn't as with the G. I'll have to wait (aside the fact i have to save of course) until i am certain what is "wrong" here...
Thanks.
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MichelvA View Drop Down
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Post Options Post Options   Quote MichelvA Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2008 at 21:45
Hi Addy,
Of course i have read the whole thread. I think some users don't have problems because of their photographic biases. Like not always shoot at f/2.8 for instance (f/3.5 for the 17-35 obviously..).
Testing won't be possible if i buy a 28-70 G first and a 700 later.
Of course it will be clear the combination will or won't work, but until now the 700 is the best choice. Opting for a lesser choice (like 300 or 350) because the 700 can have a problem..?
Think you are very right about the reflections (i mentioned it too), but maybe Sony could solve this. Let's hope so.
I wonder how you will like the G.

edit: if the Alpha "flagship" has a CMOS with these reflections too i doubt the G's will shine (at f/2.8..)

Edited by MichelvA - 16 May 2008 at 21:49
 



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Post Options Post Options   Quote douglasf13 Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2008 at 22:27
I'm doubting some of the G zooms will shine on the fullframe, regardless. Even though the pixel pitch of the A900 is similar to 10mp on APS-C, there are countless tests with the Canon 1Ds series that show the higher MP fullframes really test even the highest end lenses. There's a reason Sony is bringing Zeiss to the table.
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Post Options Post Options   Quote Octupi Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2008 at 22:46
I personally won't be buying the CZ's for the bokeh, for that I stick with the minolta/sony glass. CZ to me = Sharpness...portrait work.
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Malone View Drop Down
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Post Options Post Options   Quote Malone Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 2008 at 22:56
FWIW, I shot over 100 test shots on my friend's A700 with my 17-35G and got some fantastic results - no issues at all, inc strong backlight, sun in frame etc. plus retained the beautiful colour rendition (especially on skin tones).
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Post Options Post Options   Quote denikin Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2008 at 06:15
I could not agree with you anymore. I don't like CZ lens for portrait images. Minolta old lens's Bokeh is way better.
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Post Options Post Options   Quote Frankman Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2008 at 13:18
I don't normally buy into lens debates. I have the 28-70 G and A700. I've never noticed anything resembling "fogginess or sftness" at f2.8. Just to check, I just did a quick and dirty test. The first image 1/20sec f2.8 iso 400 (tripod used). In the background is the fishtank with lights on.



100% crop of above:



Is there any specific situation where this happens to others? I've never come across it.

Frank
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MichelvA View Drop Down
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Post Options Post Options   Quote MichelvA Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2008 at 14:13
Thanks for this very helpful contribution.
Looking at this photo, it seems not everyone has problems.
Have been reading a lot about the subject and was planning to just buy the 28-70 G.
If i want to upgrade the body later i could try it with a 700 and see from there. Alternatively i could go for the Alpha 200.
The post from the German Forum starts at #1 for problems with the 17-35G and start at #19 for the 28-70G: http://www.sonyuserforum.de/forum/showthread.php?t=53570&page=2
There are a few more threads on this, but this is the latest one.
Of course talking about the subject is not as good as trying out for yourself, but buying a lens first (prices are around $1000 or 650 here) is an expensive experiment.

edited for typo..


Edited by MichelvA - 21 May 2008 at 08:58
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vitor View Drop Down
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Post Options Post Options   Quote vitor Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 2008 at 18:02
What focal length did you took these? Try it at 70mm.
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Post Options Post Options   Quote Vagabond Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2008 at 13:03
I looked up the German thread and the photo in the first post. The "fleck" (spot) in the centre looks like an internal reflection in the lens, or flare in other words. This should not be too surprising as the photo is taken right into the sunset. Flare can happen with any lens if you have a light source at an unfortunate angle....
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