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.65x apex reducer compatibility

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#1 calypsob

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Posted 05 August 2020 - 11:47 AM

Does anyone know if the apex reducer is compatible with the Sharpstar 76 EDPH? 

I have the full frame f4.5 reducer but going to f3.6 on an aps-c is extremely tempting.


Edited by calypsob, 05 August 2020 - 11:48 AM.


#2 Tapio

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Posted 05 August 2020 - 12:02 PM

I see no reason why it shouldn't work.

The short version of it (the L version seems to be backorder).

https://starizona.co...c-acf-telecopes


Edited by Tapio, 05 August 2020 - 12:18 PM.


#3 Huangdi

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Posted 05 August 2020 - 01:22 PM

Theoretically should work, but F3.6 is very fast. I can't say for sure but I'm not sure how we'll the stars will be managed. After all, it's a cheap scope.

#4 calypsob

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Posted 05 August 2020 - 03:30 PM

Theoretically should work, but F3.6 is very fast. I can't say for sure but I'm not sure how we'll the stars will be managed. After all, it's a cheap scope.

Man i hope one day im ballin like you and $900 is cheap.

 

realistically though i dont know if it will fit in the ota the way the stock reducer does. I guess i need to compare threads.



#5 Huangdi

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Posted 06 August 2020 - 03:40 AM

Man i hope one day im ballin like you and $900 is cheap.

realistically though i dont know if it will fit in the ota the way the stock reducer does. I guess i need to compare threads.


Oh I am a very poor student, no big money here trust me :D but when it comes to really fast and high quality refractors, usually you pay the equivalent of a 18yo's first car...

#6 calypsob

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Posted 06 August 2020 - 11:34 AM

Oh I am a very poor student, no big money here trust me :D but when it comes to really fast and high quality refractors, usually you pay the equivalent of a 18yo's first car...


Yea im just busting your chops. I do wish I had known the 94mm version was on the way for a bit more FL. At f3.6 the 76 mm will just be a glorified spacecat. It is a native f5.5 so if the threads can be matched I think I will be in business

#7 Huangdi

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Posted 06 August 2020 - 11:43 AM

Yea im just busting your chops. I do wish I had known the 94mm version was on the way for a bit more FL. At f3.6 the 76 mm will just be a glorified spacecat. It is a native f5.5 so if the threads can be matched I think I will be in business


Yes the 94 version seems very promising indeed! I had originally planned to sell my soul for an esprit 100, but if reviews turn out fine I'll be on the lookout for the 94.

I somewhat doubt the performance with a full frame sensor though.

#8 calypsob

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Posted 06 August 2020 - 01:17 PM

Yes the 94 version seems very promising indeed! I had originally planned to sell my soul for an esprit 100, but if reviews turn out fine I'll be on the lookout for the 94.

I somewhat doubt the performance with a full frame sensor though.

I can share some full frame data from my a7riii
Reduced to f4.5 with the 76mm. I have not gotten spacing right quite yet but its close

Edited by calypsob, 06 August 2020 - 01:18 PM.

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#9 Ethanwyh

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Posted 06 August 2020 - 09:02 PM

I have just ordered a 94EDPH, I’m also having some doubts about backfocus details. How far was it for you to get okay stars?


Edited by Ethanwyh, 06 August 2020 - 09:03 PM.


#10 calypsob

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Posted 07 August 2020 - 06:13 AM

I have just ordered a 94EDPH, I’m also having some doubts about backfocus details. How far was it for you to get okay stars?


Well on full frame sony it has an 18.5mm flange.
So I had to use spacers to achieve 55mm. I bought a variable 2” spacer made by svbony. It lets me adjust the distance. Since I have 3 scopes and 2 cameras I have to measure and change backfocus alot. Im going to replace the svbony with this or something shorter https://www.modernas...elical-focuser/ because it has a scale on it. Right now I need to use vernier calipers everytime I change cameras or scopes.

Imo the 94edph will be even better than the 76 because it is further color corrected. If you dont have the f4.5 reducer correcter or a normal field flattener, your star field will look terrible at f5.5. Also the zwo eaf pairs very nicely to this scope, the stock focuser is awesome.


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