Devilry with an old Minolta lens…
What the result will be will depend on the lens design.
The results using the modified Minolta lens in the K10D are confusing. The new minimal focus distance is now 30cm (minimal focusing stop) and the maximum in-focus target distance (at infinite stop) is no more than 1 meter and 10 cm away from the camera.
This would imply that the lens is too far away from the sensor plane.
I understand the problematic more clear now.
Surely my lens stops a little (perhaps 0.5 mm) far away from the sensor plane when focus to infinite. And this is very well comprehended when I see the logarithmical scale in the focusing lens ring. For the closer distances the ring rotation is great, but from 10 meters to infinite the rotation if the ring is minimal (± 2 º no more).
Technically I have the possibility to adjust this difference, so hands at work…
Thanks again my friends. Will comment…
Best regards.
________________
Dirk TROTTEYN.
K10D+ Sigma 18-50 1:2.8 DC; DA 10-17 fish-eye.
Image counter: 5335.-
But at least, now I can shot at infinite (without all the fine sharpness the lens is capable) until I do the fine adjusts necessary.
Thanks again John, thanks Stevo for the proffesional help.
Best regards.
________________
Dirk TROTTEYN.
K10D+ Sigma 18-50 1:2.8 DC; DA 10-17 fish-eye.
Image counter: 5378.-
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211 posts
16 years
Tucuman,
Argentina
The Minolta lens focusing is done by moving the whole optic´s (5 glasses) front and back in a 11 mm travel for the complete focusing range (from minimal focus distance; 40 cm to infinite).
All the physical distances (lens body-film/CCD plane) stands equal in both cameras (after the lens modification).
The results using the modified Minolta lens in the K10D are confusing. The new minimal focus distance is now 30cm (minimal focusing stop) and the maximum in-focus target distance (at infinite stop) is no more than 1 meter and 10 cm away from the camera. The vision angle is just 20º (before was 46º). The sharpness is like always was; gorgeous!
The question: is any lens (for SLRC) capable to be used in any SLRC (film or digital) independently of the mount problem? I know that digital lenses not always suits in film cameras. Exists other limitation to this?
Two images. Leftmost; stop at infinite. Rightmost; stop at 40 cm. (minimal focus distance). Note the rear lens position in both cases…
The very sharp image at 30 cm!
Thanks in advance for any help.
Best regards.
________________
Dirk TROTTEYN.
K10D+ Sigma 18-50 1:2.8 DC; DA 10-17 fish-eye.
Image counter: 5333.-