Kinebohのブログ一覧

Modified old Minolta MC Rokkor 50/1,7 adapting on Canon EOS mount plays a excellent performance with wonderful resolutions. No recent sophisticated recent designed variable focal length zoom lens can exceeds this old optics, once deserted as a industrial waste.
I have some modified Leica lenses modified to adopt on old Minolta SLR bayonet mount while silver salt period, so these satisfactions done by the attempts shows some tiny light dot to survive on EOS Digital mount, it's a good news isn't it?
Automatic iris closure system often makes a photographer neglect to check the condition of out-focusing conditions, anterior and posterior blurring. On the other hand, manual iris control system never happens such kind miss-shooting, this is one of a advantage for this modification.

Rear toe correction on VW 1302 Super Beetle has acquired it's innate performance just like a different automobile revealing how deeply the rear wheel alignment and axle constructive geometry has much to do with a car riding taste. Unnatural and unpleasant steering action are not always attributed by frontal axle construction, but mainly by rear constructions.
20 degree of atmospheric temperature decrease these days has proved that the adequately adjusted air volume control screw on Solex 34PICT3 carburetor equipped in air-cooled Beetle plays a good part of it's performances including in relation with automatic choke system even after the condition of thermostat opened(out of order).

Japanese current administration has exposed the terminally ill being bankrupted on earth by trying to an appoint on behalf of the Minister of Justice predecessor for gangster, people are turning their back on all of Executive Office already, so Regime change is now.

Following my determination this morning, I have been fighting with the difficulty to set up MC Rokkor 50/1,7 on EOS Digital. O,5mm discrepancy on flange back values was compensated by helicoid setting adjusting points as imagined. Though physical impossibility of compatibility because of flange back distances as there is, MC lens constructive design to adjust infinity position of focusing ring made it possible to set back the lens component 0,5mm posteriorly. Thanks to shining 1,7 iris position, focusing is easy when it is fully opened. However deeply the recent zoom lens was considered to obtain excellent performances, to which one can this MC Rokkor 50mm standard focal length lens can be the second?

To tell the truth, I have some hidden intention to do the same on the most excellent lens in Minolta that wears the pride of workmanship that can be world-class, MC Rokkor 50/1,4 with full metal lens element case and metal helicoid system. Probably I would come to a goal with 1,4 lens relatively easily supported by the already known information of experienced two MC lenses.

Rewiring of power supply has been undergoing all through the night just in front of my laboratory. This kind of reconstruction is inevitable for the Development Station here. Not a few Special Purpose Vehicles with Crane Outrigger were terminated in our neighborhood.

As for old Minolta MC Rokkor 50/1,7 lens modification converting on Canon EOS Digital mount, flattening of flange surface was performed to insert 100/1000 mm thickness sim between the construction. Some empty aluminum can was utilized for the purpose making holes with special circular device. Old grease was removed thoroughly to change heavier friction resistance into lighter movement of focusing ring following as later models. Microflon powder would be applied in helicoid grooves. Probably final setting of infinity position of lens element would be done today.

As I mentioned yesterday, tire wear especially with the cross-sectional stepping one is a good index to know the actual condition of wheel alignment and constructive axle geometry. Excessive toe in value invites outer side inconvenient wear on the tire tread surface for rear wheels, uneven wear shows some thrust discrepancy, on the other hand, too much outer direction of toe value on frontal wheels does outer side. But, remember here, all of 4 wheels interact with each other with balancing condition. Anyway, strange steering reaction while driving an automobile would encompass any error in wheel alignment and axle constructive geometry. Careful checking and actual scaling of constructive error reveal the result of the cause exactly as usual. Physics never tell a lie.

The wear condition no tire tread surface shows how the automobile has been driven and how correctly the wheel alignment of it is established. Lost frontal tire shoulder means over speed driving especially on driver's side and the uneven shoulder wear is caused by subduction lifting posture with rolling and diving invites some sense of unease, this is why the more wear is driver's side. And stepping serrated wear like a sow tool on outside of the tread surface is affected by irregular wheel alignment and geometric axle construction, this phenomena occurs on both frontal and rear tires. This inconvenient wear like this is observed under toe out setting condition, out side of tread in frontal axle and inside in rear one. Judging from this wear condition on tire wear standing point of view, we can guess the tendency of the way of driving and the condition of axle setting before the survey on wheel alignment and axle constructive geometry.
By the way, I have never come across with any vehicles with even tire wear condition, it goes without my explanations here why? I can pass without worrying about it unless noticing this physical phenomena, but once I know the fact and the truth, I cannot ignore this kind of discrepancy in wheel alignment and axle construction as my nature. Reduce the assembly tolerance and demonstrate the physical performance of the machinery with the original design as the engineers had done with desperate efforts. I don't feel any shame if I insist on the pursuit of the ultimate objective in my own hobby world as a scientist.