A580 diff exposure settings between ovf and liveview

Specifically for the discussion of the A-mount DSLR range
Forum rules
No more than three images or three external links allowed in any post or reply. Please trim quotations and do not include images in quotes unless essential.
Scrabo
Acolyte
Posts: 9
Joined: Mon Jul 21, 2008 7:05 am

A580 diff exposure settings between ovf and liveview

Unread post by Scrabo »

I have posted this elsewhere.

Just noticed yesterday after taking some photos using the ovf and not the liveview that they were constantly over exposed but 2 full stops

Back at the hotel I setup a test and took a series of shots using ovf and liveview and they confirmed my initial finding

So the question, could it be the flipping mirror mechanism that is not seating correctly when switching to ovf ?

Is this camera worth the $300+ sony repair fee ?
User avatar
Greg Beetham
Tower of Babel
Posts: 6117
Joined: Sun May 27, 2007 3:25 pm
Location: Townsville, Qld. Australia
Contact:

Re: A580 diff exposure settings between ovf and liveview

Unread post by Greg Beetham »

At first glance I’d be inclined to think that some kind of debris has fallen on the exposure meter sensor and masked a part of it off. Only thing is I’m not familiar with the location of it in the A580, they were in the floor of the mirror box in earlier DSLR’s but that particular one I’m not sure about. Anyway it might not hurt to engage the ‘sensor clean’ mode and see if a good old brush and blow around the bottom of the mirror box does any good but you’ll have to try to not blow anything onto the sensor while you do that, and I’m stumped on how to accomplish that exactly, you need a puffer with a return angle nozzle, which doesn’t exist as far as I know.
Maybe if you got a puffer brush and taped the bristles over into a right angle fashion with some scotch tape that might work ok.
Greg
David Kilpatrick
Site Admin
Posts: 5985
Joined: Sat May 19, 2007 1:14 pm
Location: Kelso, Scotland
Contact:

Re: A580 diff exposure settings between ovf and liveview

Unread post by David Kilpatrick »

The exposure module in the A580 is located in the prism housing and not part of the AF module as far as I'm aware. It is very normal for live view and direct metering to show different results, I've just been testing the Canon 70D and despite its very advanced metering, it gives different exposures from identical scenes when switching from OVF to LV. But not by two stops.

David
User avatar
mikeriach
Imperial Ambassador
Posts: 583
Joined: Sat Feb 02, 2008 11:29 am
Location: Aberdeen

Re: A580 diff exposure settings between ovf and liveview

Unread post by mikeriach »

I'd do a similar test but since BST came to an end, I don't get home till after dark.
I'll give it a go when light permits.

Mike
All my Sony SLT gear gone. Still got my RX100 though.
Deward
Acolyte
Posts: 17
Joined: Mon Jul 15, 2013 9:15 pm

Re: A580 diff exposure settings between ovf and liveview

Unread post by Deward »

I've noticed almost the same thing on my A580. I thought (not absolutely sure) there may be a light leak through the viewfinder when using liveview that causes underexposure?? The other thing I noticed is that the actual focus point is different when using OVF and LV ...., not much, but noticeable.
User avatar
Dusty
Emperor of a Minor Galaxy
Posts: 2215
Joined: Thu Dec 18, 2008 5:04 pm
Location: Ironton, Missouri, USA

Re: A580 diff exposure settings between ovf and liveview

Unread post by Dusty »

Deward wrote:I've noticed almost the same thing on my A580. I thought (not absolutely sure) there may be a light leak through the viewfinder when using liveview that causes underexposure?? The other thing I noticed is that the actual focus point is different when using OVF and LV ...., not much, but noticeable.
Are you using the viewfinder cap when using Live View? Not sure, but I think the book for the a350 told me to use it in LV.

Dusty
An a700, an a550 and couple of a580s, plus even more lenses (Zeiss included!).
Deward
Acolyte
Posts: 17
Joined: Mon Jul 15, 2013 9:15 pm

Re: A580 diff exposure settings between ovf and liveview

Unread post by Deward »

No Dusty, I don't use the viewfinder cap and that, I suspect, is the problem. More experimentation needed.
User avatar
bfitzgerald
Subsuming Vortex of Brilliance
Posts: 3996
Joined: Fri Sep 26, 2008 10:48 pm

Re: A580 diff exposure settings between ovf and liveview

Unread post by bfitzgerald »

This is the case with all the Canon, Nikon, Pentax bodies I've used. Metering off the sensor is indeed different to the normal metering, but I would not expect a huge difference in exposure (the other makers I've used tended to "give more" exposure with the live view)
alphaomega
Viceroy
Posts: 1196
Joined: Mon Aug 18, 2008 11:20 pm

Re: A580 diff exposure settings between ovf and liveview

Unread post by alphaomega »

Just did an internal comparison same target and light intensity at ISO6400 on my A580.

OVF F7.1 1/250
Rear Screen F7.1 1/200

So there is clearly a difference in exposure reading between the two settings.
Deward
Acolyte
Posts: 17
Joined: Mon Jul 15, 2013 9:15 pm

Re: A580 diff exposure settings between ovf and liveview

Unread post by Deward »

Haven't gotten around to doing this test with and without the eyepiece cover in place. This may be the difference.
alphaomega
Viceroy
Posts: 1196
Joined: Mon Aug 18, 2008 11:20 pm

Re: A580 diff exposure settings between ovf and liveview

Unread post by alphaomega »

Did another A580 test indoor at F7.1 and ISO400 this time
OVF 1/10 second
Rear Screen 1/8
Rear Screen holding finger over OVF 1/8
So no difference recorded, but Rear Screen still slower by the same time i.e. 20%
User avatar
Atgets_Apprentice
Grand Caliph
Posts: 356
Joined: Wed Jul 20, 2011 3:02 pm
Location: Glasgow, Scotland

Re: A580 diff exposure settings between ovf and liveview

Unread post by Atgets_Apprentice »

There should be no difference between rear screen and rear screen + eye piece cover, as the viewfinder has an eyepiece blind. The difference must be down to the metering source.
XG-1, XD-5, XD-7, X-500, XG1n, X300, 7000i, 700si, 800si, 500si Super, 600si, Dynax 5, KM 7D, a100, a200, a300, a580. And another 600si.....
MichaelRoli
Acolyte
Posts: 10
Joined: Wed Dec 10, 2014 4:10 am

A580 diff exposure settings between ovf and liveview

Unread post by MichaelRoli »

Great map Thank you for sharing it. Just curious, would there have been boat access between Winnipesaukee and Winnisquam in 1881? I had never seen Winnisquam refered to as Great Bay before.
Post Reply

Who is online

Users browsing this forum: No registered users and 18 guests