Removing baffle from LA-EA1: from dpreview forum
Removing baffle from LA-EA1
Dec 4, 2013
http://www.dpreview.com/forums/post/56000117
I believe that most of you know that inner baffle can be removed from
LA-EA1 adapter. By doing so, I made few test shots to see, if it indeed
cover FF format.
(Sorry for the low image quality, I have only iPad and did transfer those small jpegs via wifi)
1. A7r with LA-EA1 and Minolta 35/1.4 AF at f/5.6
To confirm that it is not lens issue, i made another shot with LA-EA4
A7r with LA-EA4 and Minolta 35/1.4 AF at f/5.6
Another thing attracted my attention however. With lens corrections switched off and with the lens that certainly does not have pre-programed profile, in AWB, images have slight greenish cast more pronounced in the corners.
Here is another shot taken with "Dumb" Novoflex adapter and same lens at f/5.6
A7r + Novoflex Minolta A to Sony E mount adapter and Minolta 35/1.4 AF
But of course, when you can switch correction on, (camera or lens have preloaded lens correction profile) it does much better job.
A7r and Sony FE35/2.8 lens corrections switched to off
A7r with Sony FE35/2.8 at f/5.6 with lens corrections switched on.
Anyway, it still looks better than FE35/2.8 with lens correction on IMHO.
(Sorry for the low image quality, I have only iPad and did transfer those small jpegs via wifi)
1. A7r with LA-EA1 and Minolta 35/1.4 AF at f/5.6
View: original size
2. A7r with LA-EA1 with baffle removed and Minolta 35/1.4 AF at f/5.6
View: original size
As you can see, it is almost good but there is a bit of remaining vignetting in the extreme corners.To confirm that it is not lens issue, i made another shot with LA-EA4
A7r with LA-EA4 and Minolta 35/1.4 AF at f/5.6
View: original size
So, LA-EA1 with baffle removed almost cover FF, but not 100%. As I
don't have LA-EA3, I can't comment of other possible differences, but I
doubt there is something significant.Another thing attracted my attention however. With lens corrections switched off and with the lens that certainly does not have pre-programed profile, in AWB, images have slight greenish cast more pronounced in the corners.
Here is another shot taken with "Dumb" Novoflex adapter and same lens at f/5.6
A7r + Novoflex Minolta A to Sony E mount adapter and Minolta 35/1.4 AF
View: original size
As you can see WB reading is entirely different and there is no
visible greenish cast in the corners. This is IMHO indicating, that SONY
does apply some lens corrections whenever native lens or lens with
electronic contacts is registered, no matter if the corrections are
switched off or on.But of course, when you can switch correction on, (camera or lens have preloaded lens correction profile) it does much better job.
A7r and Sony FE35/2.8 lens corrections switched to off
View: original size
And the same combination with lens correction switched on (in this case only vignetting is relevant)A7r with Sony FE35/2.8 at f/5.6 with lens corrections switched on.
View: original size
Back to the LA-EA1 transformation, If you like what you see here, and
don't know how to remove baffle, just look at your adapter from the
back (camera mount side). You will see 3 philips screws there, that
should be released. You don't have to take them off, just fully release
them and take the whole baffle out. It can't be much easier and if you
can live with a little vignetting in the extreme corners, you can save
few bucks.Anyway, it still looks better than FE35/2.8 with lens correction on IMHO.
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