Takahashi CN-212 Cassegrain Lens Barrel and lens barrel band w/ 7x50
finderUSD $3,020.00
Condition : Used
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Condition is good.
I don't see any mold or scratches on the mirror surface (this is my amateur judgment).
The lens barrel has a slight dent from hitting the equatorial mount, but this does not affect observation at all.
- Includes only the Cassegrain lens barrel and lens barrel band (painted white), 7x50 finder, eyepiece, and lens barrel lid.
・There is no Newton unit.
・For planet photography, I added two fans as shown in the photo.
(Please note that the equatorial mount and eyepiece in the photo are not included) As shown in the astronomical guide test article in the fifth photo, it has excellent optical performance.
``Ronchi test results
Classic Cassegrain has spherical aberration removed, so if it is ideally polished, you should see a straight Ronchi. The Ronchi actually observed was as shown in the figure, with a curve approximately 1/8 the width of the light and dark pairs. The acceptable Cassegrain focus is F 12.4, or 1/4.03, so this can be considered a very good result.
The results of the Ronchi test, which is a measure of high magnification performance, were quite high as shown in Figure 29. This is an example of how good results can be obtained by properly making a paraboloid with well-established testing and polishing methods, seriously manufacturing a secondary mirror to match it, and properly assembling and adjusting it. ” 100% official product It is also sold in Japan, so please purchase it as soon as possible. Import duties, taxes and fees are not included in the item price or shipping charges. These charges are the responsibility of the buyer. Please check with your country's customs office to determine how much these additional costs will be before bidding or purchasing. Items are to Japanese specifications. All electrical appliances are 100V compatible. Remote area fees may apply.
I don't see any mold or scratches on the mirror surface (this is my amateur judgment).
The lens barrel has a slight dent from hitting the equatorial mount, but this does not affect observation at all.
- Includes only the Cassegrain lens barrel and lens barrel band (painted white), 7x50 finder, eyepiece, and lens barrel lid.
・There is no Newton unit.
・For planet photography, I added two fans as shown in the photo.
(Please note that the equatorial mount and eyepiece in the photo are not included) As shown in the astronomical guide test article in the fifth photo, it has excellent optical performance.
``Ronchi test results
Classic Cassegrain has spherical aberration removed, so if it is ideally polished, you should see a straight Ronchi. The Ronchi actually observed was as shown in the figure, with a curve approximately 1/8 the width of the light and dark pairs. The acceptable Cassegrain focus is F 12.4, or 1/4.03, so this can be considered a very good result.
The results of the Ronchi test, which is a measure of high magnification performance, were quite high as shown in Figure 29. This is an example of how good results can be obtained by properly making a paraboloid with well-established testing and polishing methods, seriously manufacturing a secondary mirror to match it, and properly assembling and adjusting it. ” 100% official product It is also sold in Japan, so please purchase it as soon as possible. Import duties, taxes and fees are not included in the item price or shipping charges. These charges are the responsibility of the buyer. Please check with your country's customs office to determine how much these additional costs will be before bidding or purchasing. Items are to Japanese specifications. All electrical appliances are 100V compatible. Remote area fees may apply.
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