Kinebohのブログ一覧

In spite of hottest season these days, I visited my ancestral tomb today before noon at Shitaderamachi around Nipponbashi. Pics shown are taken at Temma-Tenjin at Minamimorimachi. After this affair, we came to Osaka Imperial Hotel for lunch, celebrating my elder sister's 74th birthday, Chines Dishes served there were all well designed and seasoned.

Taking relatively long time to re-set 13 iris blade in the adequate position, finally I have succeeded in completing fairly well. Though the construction of this old Minolta lens is merely Triplet with less correction of aberrations, less grass materials and less number of reflective surfaces make the light signal easy to arrive at the imaging surface, leading to purely transparent and clean pics. Clean and transparent light source or well corrected light signal by sophisticated computer analysis, which is the better on Earth? Old lenses have some disadvantage compared with recent designed and expensive ones, less picture quality when used at iris fully opened position, flare, halo and ghost are the criminals. On the other hand, such kind of disadvantages might be utilized intentionally, as some specific Physical properties those are not contained in recent ones. Shortage might be changed into specific advantage, depending on the intentions of photographers.

So pretty lens for mountain climbing use Rokkor TC 100/4 Triplet was obtained at 1,000 yen. Because of the oil invasion into iris blades, the function was lost in addition to moderate mold development as usual. As for external appearance, no hitting, no scratches and no parts loosing, with genuine hood was good gospel this time. After removing sticky oil on the every iris blade, complicated like puzzling procedure is waiting, reassembling them firmly at an adequate position with keeping precise opening rate according to an original marking on the fuselage, now I'm on the way to complete it killing free and boring time. Before that, lens surfaces are kept clean and transparent utmost by my desperate efforts.

Very smart, cute and old standard zoom lens designed by Ernst Leitz Co. and manufactured by Minolta is at hand equipped on Sony Alpha 7 digital format. Judging from the reports, the performance is superb though with less magnification, zooming ratio to double and slight spindle shape distortion. Remembering my desire for actual using focus length, the range is enough. There exists some difficulty while SLRD period because of Minolta's 43.5 mm, shorter flange back length, but now is the paradise period for any old lenses with some smaller lens back and flange back, yes, mirror box length has reduced with sophisticated recently established EVF technology. Next weapon to be enjoyed is this pretty one, reporting later.

Not so busy but not so free condition while Bon-holidays made me determine to disassemble the lens unit thoroughly in Minolta MD Zoom Rokkor 100-300/5.6 into the depth of zooming lens unit inside. Though the performance had been recovered enough by cleaning front and rear unit to satisfy my requirement under the condition of Photoshop application program, very slight mist in the zooming unit that could not be cleaned until disassembled completely was there. After some interval to be at a loss which way to choose do or not do, I came to the conclusion to proceed the way however difficult and however much barrier might exist on the way. I have realized after doing that the number of constructive parts are not so many and relatively easy to reassemble with precise optical adjustments such as iris closing position and final infinity position, boring time today will be killed by this complicated reassembling procedure of this Minolta Zoom lens.