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Originally posted in need help with equipment but no replies so hopefully it gets more traction here.

 

So today I came into a great deal on a Takahashi FC-100 for $80. Yep, I couldn't believe it. I get it home and try to put my 2" accessories and diagonal to find the scope opening is too big, measuring at 2.75". Some of the other stuff in the photos I have no idea what they are and I have a whole brochure page I need to get translated. Any help is appreciated. I'm looking at a Baader Takahashi Adapter M72/68 and that seems to be what I need but maybe not because 68 mm = 2.66" so maybe that is wrong. Looks like these may be some solar lenses also. Will be used for visual as I do not have the talent and am not currently in a good location for photography. 

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That's a coronograph, used to occult the body of the sun so you can see the much fainter prominences around the edges. 

I've only seen antique scopes built to have the occulting disk (that filter thing) further up the tube. The prominence on the picture gives it away. You might find that scope is built specially for that purpose alone. 

Also, normally there are multiple different sizes of occulting disk to take into account the different apparent size of the sun during different seasons. Do you have them ?. I'd buy that from you if you're not going to use it. First time I've seen one. 

The other widget with screws on is a reticle projection unit used for guiding. 

Does that help ?

Mike

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Oh and baader also do a 68/60/56 mm eyepiece clamp that would fit so with the adapter you mention you should be good to go. You can also find them at telescope express. 

MIKE

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Although I've never used a prominence eyepiece before, I can read Japanese and the user manual in your pictures clearly states it is one of these.

You will need a Baader Ultra short 2" eyepiece clamp (https://www.baader-planetarium.com/en/baader-ultrashort-2"-eyepiece-clamp.html) to go along with the M72/68 Tak adapter before you can use your existing 2" accessories.

BTW congrats on getting a Tak 4" fluorite for only $80.

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Actually I'm surprised that you need an adapter, you seem to have everything you need for the prom filter and it should take a 1.25"e.p. directly. Unless it's 2" fittings you are short of. 

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33 minutes ago, skybadger said:

Compare it with this:

https://astromart.com/classifieds/astromart-classifieds/solar-filters/show/eclissun-coronagraph-sale-pending

KP82 Can you read the manufacturer ? I can't find one on the web from takahashi. Borg maybe ?

 

The manual actually states it is a "self made" (自作) prominence eyepiece. I don't know if "self made" here implies Takahashi?

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Thank you so much. I figured out they were some kind of solar filter but wasn't about to go point it at the sun right away. I put the assembly in the first picture together and that does fit in the extensions but when I measure it and try to fit my 1.25" eyepieces they just sit flush with the extensions. It seems to be a very custom set.

As far as selling the coronographs, it may be something I'm interested down the road as I have never used one before nor do I know too much about them and I love looking at the sun. I have three total but one of the metal cones is not on the glass disc like the other two are so that would need to be fixed. Sadly I'm not in an area of Japan where I can easily take this somewhere and have it looked at.

I've tried every combination of extension, my diagonal, and straight 2" and 1.25" EPs but nothing works so I'll have to get the above mentioned products. I have three scopes but one mount right now so I'm trying to use the same diagonal for two refractors. I'm also going to have to find a way to mount the scope on my Atlas EQ-G

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