Post by yashica1943 on Sept 20, 2013 4:41:39 GMT -5
Went along to my camera club last week, a friend had two nice clean lenses marked Yashica in a case, didn't know what they fitted to, so I told him that they fitted on the front of the Electro 35. As I have a really good clean chrome example I took it to the club and showed him. Result, I now have a 'wide' angle and 'telephoto' attachment. Might even get the viewfinder if he finds it! Interested to see how they perform.
Most supplementary lenses reduce the performance of the prime lens, especially the wide angle, not so much in sharpness, but the wide converter usually induces barrel distortion, and the telephoto version show pincushion distortion.
It is all a trade off against loosing too much sharpness, or the lens being too costly and expensive to market.
Where the original maker supplied them, as with Yashica, the balance will be OK at everything bar full open aperture, where loss of sharpness may show more.
For ordinary sized prints or a computer screen, thy will look as sharp as usual, at medium apertures (bright light), it might show the distortion a bit dependent on the content.
One point though, to get the best, they must be perfectly clean, as should the main lens be, and use a lens hood, as the extra glass reduces contrast. Dust and dirt will show as flare with the add on glass.
This is the reason comparison shots with and without may not compare well on "quality". If a sequence is taken with say the wide angle, then any flaws do not show, there is nothing to compare them too!
Yashica claimed the supplementary lenses they did were optically matched to the main lens, and I suspect they took far greater care than any independent maker to get the performance right. But I also suspect they went for sharpness at the expense of a little distortion.
Most people find auxiliary lenses a pain to use on a rangefinder because of the procedure to focus. You have to focus first, then read the distance off the scale, then reset the focus for the correction according to the scale on the auxiliary lens. As I recall, the Yashica lenses didn't offer much wider or closer views than the normal lens. It is nice to have the lenses to complete the set, so good luck on finding the viewfinder.