p.4 #1 · The Glass in the Path: Sensor Stacks and Adapted Lenses
AhamB wrote:
Read the thread? There's someone on page 2 who has done it and says he gets better performance with M mount lenses.
Thank you for pointing that out to me ! I wonder if Max Max or someone else can do the conversion - it would be great if the removal of the glass and a modified adaptor would enable us to use Leica lenses on the A7R again,
I would be happy to buy a second modified body just to use all my Leica glass again even if I have to fit IR filters on the lenses.
Looks like an opportunity for someone to offer the modification service and the shorter adaptors :-) :-)
p.4 #3 · The Glass in the Path: Sensor Stacks and Adapted Lenses
Jon Tainton wrote:
You'd then have to hope the A7R microlenses are similar to the CMOSIS M http://goo.gl/q4epnT
I am not too concerned with corner shading issues or colour casts as they can be easily corrected in post unlike the sharpness problem which as far as I can see is caused by the sensor glass characteristics.
p.4 #4 · The Glass in the Path: Sensor Stacks and Adapted Lenses
_julian_ wrote:
I disassembled an A7 and removed the filter stack for better performance with M lenses - especially wider angle lenses. The A7 filter stack was measured at 1.8mm with an outside micrometer.
This doesn't include the first-birefringent layer epoxied to the ceramic carrier which I didn't remove.
Generally the birefringent layers are thicknessed according to the pixel size - eg. smaller pixel wells, need thinner glass due to the way the low pass filter works.
This explains why the A7r disassembled by Roger measured a slightly different value to my A7.
Incidentally, I got an M-mount adapter re-machined to get infinity focus back, and am using M lenses fairly successfully with improved corner performance. ...Show more →
Do you have some photos made with wide M lenses which you could post? Lenses which typically have trouble with the A7 would be perfect, if possible.
There's someone on page 2 who has done it and says he gets better performance with M mount lenses.