Author Topic: #1 a700 v #2 a700  (Read 10908 times)

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Offline Frank [aka Wires]

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#1 a700 v #2 a700
« on: September 04, 2008, 09:30:35 PM »
Sorry if this is in the wrong area but as it's to do with the A700 I'm probably, I hope, posting in the correct section :)

I think I may have got on some members nerves a few weeks ago regarding the lack of sharp images I was getting from my a700. With some patience and guidance I did some focus tests which determined there was a focus issue and returned it to SONY for "repair/service" in July.

Well... I'm sorry to return to it but I'd like some others eyes to check thses two images. In the A700 prices thread I finally mentioned I'd purchased a second a700 from Buyacamera. This afternoon I decided to put #1 camera against #2 [the new one] to check for focus comparisons. Check virtually all my glass but I'm only posting two images - both using my Minolta 50mm f1.7 lens.

Sony a700 camera #1 with Minolta 50mm f1.7 @ f2, spot focus.


Sony a700 camera #2 with Minolta 50mm f1.7 @ f2, spot focus.


Opinions please :)

edit; sorry - tripod mounted, cropped slightly to increase zoom/size, cable release.
« Last Edit: September 04, 2008, 09:32:16 PM by Frank [aka Wires] »
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Offline Stef.

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Re: #1 a700 v #2 a700
« Reply #1 on: September 04, 2008, 09:36:45 PM »
Frank- at first sight No.2 looks better BUT I think this has to do with the light. Has the light changed as obviously no.1. is darker (might have been a cloud in front of your window!?!) I think the reason why no.1 looks less sharp has to do with the fall off of the light. Now I personally would repeat that test in a room where the light does not change and perhaps use a flash? It is very difficult to judge the sharpness of these images when the parameters have changed.
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Offline Frank [aka Wires]

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Re: #1 a700 v #2 a700
« Reply #2 on: September 04, 2008, 09:43:46 PM »
Your quite right Stef... the room did get slightly darker.

One other reason I cropped in was to attempt taking that in to consideration. Zooming in further the middle [centred focus point] battery looks slightly blurred compared to in #2. I didn't think/feel that the slightly darker environment would take away from the sharpness... #1 was at 1/80sec, iso 200. #2 was at 1/80 sec, iso 250.

I'll try again tomorrow but the other shots with the other lenses give somewhere the same results.
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Offline Stef.

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Re: #1 a700 v #2 a700
« Reply #3 on: September 04, 2008, 09:48:24 PM »
I see your point. I assume you have focused onto the middle battery as also in No.1 which is at the moment the worse focus the right hand side battery is sharper. I assume you are referring to still having a front focus problem?  I still think to compare it 100% one has to have exactly the same settings in exactly the same environment. (Light; ISO; Shutter speed and so on) I might be wrong and others come back with a different answer but I would not yet despair!
Good luck
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Offline Frank [aka Wires]

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Re: #1 a700 v #2 a700
« Reply #4 on: September 04, 2008, 09:53:04 PM »
Thanks Stef... I'm trying to keep :) ing ;)

I'll attempt the same again tomorrow and put all in manual and see what - if any - differences I get. I'll just use the 50mm for now... don't want to be a "bore" [again] ::)
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Offline Stef.

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Re: #1 a700 v #2 a700
« Reply #5 on: September 04, 2008, 09:54:52 PM »
Frank- you are not a bore at all! This is all very interesting. Hope it works out though!
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Offline Rob aka [minolta mad]

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Re: #1 a700 v #2 a700
« Reply #6 on: September 04, 2008, 09:55:15 PM »
Still think there are focus issues with your no 1 A700 (wow 2 A700's !)
I agree with what Stef is saying about the light, though i feel that you have FF issues judging by the amount of OOF on the batteries.
Shot 1 i'd say the focus is between both batteries, but 60/40 towards the middle one, where shot 2 it is spot on the middle battery.

But a test in the same light would confirm it, as would a manual focus shot on A700 1 ???




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Offline Frank [aka Wires]

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Re: #1 a700 v #2 a700
« Reply #7 on: September 04, 2008, 10:06:17 PM »
Cheers Rob...

Yeh!... 2 a700s :-[ :-[ - only because of the price from Buyacamera at £599.99 with kit lens and the way I kept pushing it in the thread on the a700 prices... downside [?] is I also have 2 1870 kit lenses :-[

IF I get the cash back then I'll be over the moon :D If I don't then I'll still be happy... especially if #2 prooves #1 is still not set properly - maybe I'll push SONY for a full refund ;) That could be pushinh it a bit far though :lol:
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Offline Frank [aka Wires]

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Re: #1 a700 v #2 a700
« Reply #8 on: September 04, 2008, 10:08:03 PM »
Frank- you are not a bore at all! This is all very interesting. Hope it works out though!
Stef. :P

Ahh! Gee! Thanks Stef :-[ ;)
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Offline Rob aka [minolta mad]

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Re: #1 a700 v #2 a700
« Reply #9 on: September 04, 2008, 10:19:00 PM »
For the 2 kit lenses there is always ebay, i picked up one for my 7D just to sell it with a lens. And they do go on there.

I'd certainly try for a full refund, you've got nothing to loose. Failing that you get it repaired again, hopefully this time properly. I know what its like when things arent right (the Sigma 10-20 saga :-() so i sympathise with you.


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Offline tpe

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Re: #1 a700 v #2 a700
« Reply #10 on: September 04, 2008, 10:20:00 PM »
#1 FF, #2 spot on. If you have to send it back more than 3 times it is generally policy to replace or refund, thats what happened to mine and i got the purchase price from sony, i hope you get the same, it took a lot of persuasion and persiverence but was well worth it even though i had to spend nearly about 6 months without a camera. Make sure you dont give in, you are 100% correct it is a classic case of FF, no matter what sony/the shop or anyone else says.

Keep at them dont give up. It will work out in the end and then it will all have been worthwhile.

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Offline Bill

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Re: #1 a700 v #2 a700
« Reply #11 on: September 05, 2008, 12:18:51 AM »
Frank,

Back up just a touch and re-shoot the photos.  When you are REALLY close and wide open, even small vibrations or the floorboard moving as you change your weight from one foot to the other can have an effect on the photo.  I know it sounds wierd, but at f/1.7, the depth of field is quite shallow...within a few millimeters...when you are at minimum focus.  Also, when I first began trying this myself, I found that all of my 50/1.7 lenses had a bit of back-focus.  I later found that the older lenses all had a bit of focus issues.  Newer "made for digital" lenses showed less of this.  My newer 50/1.4 RS had no problems, and my 100 macro RS had no problems either, but the beercans did.  This is really only noticeable wide open and close to the subject, but it is frustrating!

Is each lens different, or do they all display the same amount of focus issues?  Remember that the center battery should be clear right at the front, the front battery should be most out of focus and the rear battery should be somewhere in between.

Also, remember that a longer focal length will show more drastic results.

Here is one I took a few months ago when I first bought the 24-70 Z SSM.  This is also at 50mm, but it is f/2.8 (wide open).  This is the way the results should be...center spot on, rear is a bit out of focus, front is more out of focus.

Bill


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Offline Dr.Theo

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Re: #1 a700 v #2 a700
« Reply #12 on: September 05, 2008, 12:19:34 AM »
oh man this scares me, it will be ten months of ownership before i get my camera back in my hands from sony aand who knows what pics it will produce when i do........................... back focus on a camera of this level right out of the box is crazy, but the shear level for people having focus issues is nuts and that sony can not get the repairs right owowowowowoww
The first step is admitting you have a problem.
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Offline Frank [aka Wires]

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Re: #1 a700 v #2 a700
« Reply #13 on: September 05, 2008, 10:20:57 AM »
Thanks all for great suport :)

Bill; As per the previous time I followed your's and others advice and set up to avoid as much as possible any vibrations. This morning the tripod was set firmly on a soft, deep carpet to absorb waht, if any, vibration may occur. I also used the cable release to fire the shutter. Unfortunately virtually all my other glass shows similar results. The only one that seems "variable" - in as; little diff if any! - is the Tamron 1750 f2.8 :(

I don't want to clog up the forum with posting shot after shot so I may just send all to flickr once I've renamed as for the lens and focal lengths in each step/check and camera 1 & 2.

OK... shot again this morning. Lousy weather so inside, house lights, set to manual, Min 50mm f1.7 at 1/20 sec for both cameras.

#1 camera;


#2 camera


I've cropped to the edges to give a better zoom view... I did crop the first shots put up yesterday but didn't get them "central" which was the reason the shots seemed slightly off centre. Focus point is the "M" area;

Cam 1


Cam 2
« Last Edit: September 05, 2008, 11:18:07 AM by Frank [aka Wires] »
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Offline Dr.Theo

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Re: #1 a700 v #2 a700
« Reply #14 on: September 05, 2008, 11:18:39 AM »
#2 all the way
The first step is admitting you have a problem.
A700/7d/A100 sony 50/1.4|70-200 ssm|70-300G|CZ 16-80|Min 17-35G|
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