正立ミラーシステム(EMS)を開発した松本龍郎のサイト。 たった2回の反射で天体望遠鏡の像を正立像にします。
Tatsuro Matsumoto; Inventor of the EMS, Erecting Mirror System. EMS offers non reversed upright image with no additional undesirable abberations.
カテゴリー: BINO Progress Report | 製作状況速報
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I have made a simple battery holder for the TTS160-Mount.
I hit on an idea of replacing the sub-weight with the battry, after having the trouble of the power cable twining around the mount.
Here is the experiment of showing the difference of the reflectivities of Aluminum and Silver coatings.
Even the Aluminum sample of the larger mirrors quoted on the Maker’s website as enhanced Aluminum coated of 96% reflectivity, the difference between the Silver one is enormous.
説明不要と思いますが、最初の大きいミラーがアルミ、後者の小さい方が銀ミラーです。前者も、メーカーが96%の高反射率を誇示するアルミ増反射だそうですが、銀との差は劇的でした。試しに取り寄せてみたのですが、残念ながら、剥離後、銀で再蒸着しないといけません。
(今回に限らず、業者さんの数値表記は当てになりません。下請け、孫請けの言うことを鵜呑みにして、自らチェックできる技量がないのでしょう。)
As I mentioned in the report dated 6/26, I added the set-screws of the larger Helicoid from 3 to 7. As the Helicoid was additionally processed from the original 3 of 120-deg. span, two of the 7 set-screws are dummy. The next lot of the larger Helicoid will have 5 set-screws with 72-deg. span.
Judging from the terrestrial viewing the unique oiled three- elements objectives seem to be superb.
But, my concern is other aspects of the OTA.
This OTA was also rather top heavy and I could not shift the OTA forward enough I wished to do. It’s not fault of only this OTA, but I can say about all of the high graded three elements Apochromatic OTA. But I wonder why the concerning guys who claims that they are interested in my EMS-BINO would not make effort of solving the COV(Center Of Gravity) issue.
Anyway I made my best in shifting the OTA forward as far as possible.
I found the knobs of the focusers would collide with the pillar, I set them on top instead of the bottom.
The focuser was replaced from the original one to the Feather Touch True-3-inch type. But I think the normal 3-inch type was enough for this purpose. The end adapter was unnecessary.
FTF(Feather Touch Focuser) has established the status of high quality focuser, and many of the high graded OTAs take it. I also think the focuser is good but only in the rotation clamp, it is not good. The clamp is not efficient even when I fastened the three knobs so tight.
Many of the OTA makers seem to be interested in my EMS, but very few seem to seriously study the EMS and think the suitable spec of the OTA as the material of the binoscope.
Back-focus is one of the example. Providing the shorter tubed OTA specially for binoscope planner is not enough,I think. I recommend them to produce the shorter tube as the default and provide the extension tubes for the single use.