Kinebohのブログ一覧

I have just lost my good chance to obtain long waited new car for myself again, because my son decided to introduce a new X-Ray system into our business forcibly, yes, the prices of them are almost the same. Some external factor or trigger to change something is necessary for me, if the machinery works well with originally designed performance. It is true that digitization of image processing is worth inviting into our business in order to obtain good information for diagnosis in every situation. A long lasting equipment but based on old systems is difficult to be changed if it works well. The proposal done my son was a good opportunity for switching my old and entrenched concept. As a matter of fact, I have lost a good chance to replace my old car into new one, this phenomena has been repeated several times, yes, I'm a victim on earth. In addition to the matter, one of my keeping car would be forfeit by my another son, the most lovely one in the best condition after some desperate efforts for maintaining works by myself. I'm a miserable person, am I?
They must well understand my character that I cannot deny?

I have determined to modify Minolta MC ROKKOR-PF 58/1,4 standard lens adopting onto Canon EOS Digital mount with the condition of perfect infinity focusing compensating 0,5 mm flange-back discrepancy between Minolta SLR and Canon EOS. The flange part of this lens is grooved outside 0,20mm on the surface to be attached on EOS flange already, so compensation value would be residual 0,3mm on helicoid adjusting.
I came across with some very interesting description about ROKKOR-PF 58/1,4, though I didn't pay attention to such a old design optic at all, my concentration was drawn into his writing about the performances of this lens.
"Though the picture quality is not enough in the condition of iris fully opened, one or two step closing the performance would be available in this digital age. The expression is different from later MD models, so it is suitable for shooting still lives rather than powerful wild lives, the manner of this lens is delicate and smells something Orient." , so written in the article found in a Web site.

Now I'm on the way of this hobby work, unnecessary automatic iris open closure constructions are thoroughly removed this time, cam, spring, rotating part and ball bearing, etc.

Leitz Macro Elmar-V 65/3,5 is also available on the helicoid module I did by myself establishing interchangeable infinity flange-back distance, Asahi Pentax K-helicoid Extension Tube make it possible to close up to 1/3 magnification, more closer situation requires additional extension tubes. The purpose of insisting on this old lens and why the use of this one is worthy so much are reported much in the Web sites. Simple Triplet designing as it is, most of the user of this put an emphasis on the extraordinary superb resolution of three dimensional objects. No other similar focal length Macro lens would catch up the specific character of Macro Elmar-V 65/3,5.

I have been keeping Canada Leitz Telyt-V 280/4,8(11914) telephoto lens, also Leitz Wetzlar Telyt-V 200/4(TELOO 4 no adhesion elements optical　design), those were designed for Vosoflex system use 50 years ago and they are still now in MINT condition at my hand. As unnecessarily broad image circles design made it possible to utilize on more bigger formatting images, both of them had been modified to adopt onto Asahi PENTAX 67 body through DIY adapter was so re-modified as to be set onto Canon EOS digital imaging format. Of course, Flange-back distance is so established to meet precisely with infinity position promptly. Though production company is not the same, Canada Leitz and Leitz Wetzlar Germany, I am in a great happiness to enjoy their lens characteristics on Digital formatting image now. Among them 200mm focal length one would be a good control to compare the physical property with the same angle of view lenses by another production companies.

A picture shows the difference of reflection on the iris surfaces between MD ROKKOR 28/2,8 and MC 28/2,8. 20 years older MC model has shinny surfaces on both sides, anterior and posterior compared with MD model, then what will happen if some shinny plate is positioned in the middle of lens constructive component? Even now, every optical company makes desperate efforts to prevent the light source reflection and to increase the transparency, the answer is clear before my further descriptions. We should eliminate any unnecessary reflections in the lens designing component as less as we can, because the reflected light source would continue the phenomena till it ends by attenuation. We cannot know how, when and where it happens before unpredictable shooting situations, so any lens barrel and mirror box internal reflection could be a ringleader of poor quality of the works. Any chrome plated shinny surfaces like bayonet mount nails should be eliminated by some masking work with some anti-reflection materials. I'm going to bring these 2 Minolta lenses to compare each other to know the effect of difference of iris surfaces processes, under the condition of relatively closed iris setting on Canon EOS 7D digital image format. It is a matter for gratifying that nobody complains on my chronic disease like hobby plays because of the cheapest costs for material purchases.
As I took VW 1302 Super Beetle on last Thursday, I would take BC7 SUBARU Legacy LSi 4WD today that had been recovered from critical failures on the chronic disease, automatic rear transfer clutch dysfunction.