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TS (Sharpstar) 140mm triplet F6.5

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#26 LRSibb

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Posted 09 March 2020 - 01:19 PM

Received the 2.5 Inch Flattener from Sharpstar directly - no sign of 3 inch reducer yet. 

 

Picture of 2.5 Flattener on scope:

 

 

 

SHStar 2.5 APO Flattener.jpg


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#27 LRSibb

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Posted 09 March 2020 - 01:40 PM

Looking at the Sharpstar site -  it appears that the backfocus requirement varies by FL - for the 910 mm 140PH  I will need to bring it up to 88mm. Pictured above is standard 55mm which will have to be lengthened. 


Edited by LRSibb, 09 March 2020 - 01:41 PM.


#28 Der_Pit

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Posted 10 March 2020 - 06:36 AM



There is a nice camera rotator collar that moves smoothly.  

Where is this rotator situated?  Is it at the 'big end' (telescope side), or the last (smallest) element? 

I.e., if I add a reducer etc. to the 68mm thread, can I adjust the whole unit that way?

I found the TSFlat25Del that would connect directly to the M68x1 and have M48 with 55mm BF on the other side, which would directly connect to the ZWO package (OAG, EFW and camera).  It's only a 2-lens flattener though - not sure about the optical/color quality...

 

Edit:  So is it the yellow/brass screw that secures the rotation?


Edited by Der_Pit, 10 March 2020 - 06:37 AM.


#29 LRSibb

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Posted 10 March 2020 - 12:21 PM

The rotator is at the "big end"  - yes the brass colored knob is the securing screw for it.

 

Yes - The entire unit then moves with the rotator.

 

A correction - the picture above with the Sharpstar Flattener is correct within a mm or two  - The 88-90 mm backfocus includes the conical adapter.



#30 elgol20

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Posted 12 March 2020 - 04:00 AM

Hi,

can you comment on the spotdiagrams?

I wonder why the Sharpstar seems to have quite large ones.  I tried to insert the ones from RASA 11 and Tak FSQ 106, scaled,

taken from

 

 http://www.sharpstar...series/232.html,

 https://www.astronom...ount-12078.html

http://www.takahashi...ptics.spots.htm

Attached Thumbnails

  • sharpstar 140 apovsFSQvsRASA11.jpg

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#31 sharpstar

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Posted 15 March 2020 - 04:01 AM

Hi,

 

It's not correct way to compare , because:

 

1) You used a center spot of FSQ but not use a edge (22mm) spot to compare. You can see at the edge of full frame, our spot is smaller. 

 

2)Our center spot is a bit big because we consider entire image which should be average, we of course can let center spot smaller, but the edge spot  will be bigger.

 

3)The wavelength are not the same, our wavelength is from 436 to 707,other brands some APOs normally is from 436 to 656. 

 

Thank you.


Edited by sharpstar, 15 March 2020 - 08:56 AM.

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#32 MirkoV69

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Posted 16 March 2020 - 11:11 AM

Hello

 

They now corrected the description on TS web page for the corrector, specs are now matching the Sharpstar reducer for 140

 

(still the Technical Data tab in English is mismatched but the German one is consistent)

 

Mirko


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#33 Der_Pit

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Posted 18 March 2020 - 04:39 PM

Yes, they eventually have received the first batch, and substantially updated the webpage.

So I finally pulled the trigger and ordered one, together with an Riccardi 1x flattener.  I just hope it can make its way to the Canaries in all this Corona-chaos shocked.gif

 

In doubt I'll have much more time for pleasant anticipation grin.gif


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#34 25585

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Posted 19 March 2020 - 06:07 PM

Yes, they eventually have received the first batch, and substantially updated the webpage.

So I finally pulled the trigger and ordered one, together with an Riccardi 1x flattener.  I just hope it can make its way to the Canaries in all this Corona-chaos shocked.gif

 

In doubt I'll have much more time for pleasant anticipation grin.gif

Canaries are in lock down like the mainland Spain?


Edited by 25585, 19 March 2020 - 06:08 PM.


#35 Der_Pit

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Posted 20 March 2020 - 05:37 PM



Canaries are in lock down like the mainland Spain?

Yes, traveling and individual mobility are regulated here, too.  But freight should work, at slower-than-usual pace though (and the usual one is already quite - unhurried).  I'll see what happens.


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#36 25585

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Posted 20 March 2020 - 05:41 PM

My brother is in Tenerife. Only 1 person per car now he says.



#37 Der_Pit

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Posted 20 March 2020 - 05:54 PM

Yes, and they have police control points at many places, asking everyone in a car why/where he/she's going.   But so far it seems to go quite smooth here.  Really tough though for all the small shops etc.  My friends have a dive center, and now sit at home and watch as money drains :(

 

Sorry for slightly OT.

 

As for topic:  I'll of course report once I have it :D


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#38 MirkoV69

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Posted 22 March 2020 - 12:40 PM

Hello all 

 

Did you see the unboxing of the 140 on TS instagram ?

 

https://www.instagra...g_web_copy_link

 

awesome !

 

Stay safe guys

Mirko


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#39 LRSibb

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Posted 22 March 2020 - 03:01 PM

Received and installed the 3" Reducer /Flattener.

 

Focus now almost at shortest position - nail biting when I focused it..... First light subs look great.  

 

 

 

 

140PH wreducer.jpg

 

 

 


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#40 LRSibb

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Posted 22 March 2020 - 06:21 PM

First Light Sharpstar 140PH w/reducer

 

IC 443 in bicolor

 

Only 2 Hours of data - 3x 1200 sec Ha , 3x 1200 sec SII

ZWO 1600 MM Pro CGEMII (DIYHypertune) , ZWO OAG, 174 MMmini Guide Camera

March 20 2020 Backyard Calgary Alberta - Significant LP (too much for OIII)

 

 

 

https://www.astrobin...a4ha36/?nc=iotd

 

 


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#41 MirkoV69

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Posted 23 March 2020 - 04:20 AM

Sweet !

 

thanks for sharing

 

Mirko

 

 

 

 

 

First Light Sharpstar 140PH w/reducer

 

IC 443 in bicolor

 

Only 2 Hours of data - 3x 1200 sec Ha , 3x 1200 sec SII

ZWO 1600 MM Pro CGEMII (DIYHypertune) , ZWO OAG, 174 MMmini Guide Camera

March 20 2020 Backyard Calgary Alberta - Significant LP (too much for OIII)

 

 

 

https://www.astrobin...a4ha36/?nc=iotd


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#42 LRSibb

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Posted 30 March 2020 - 10:21 AM

More first light work with the new 140 - Comet C/2019 Y4

 

https://www.cloudyni...tack-and-video/


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#43 MirkoV69

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Posted 01 April 2020 - 03:18 PM

More first light work with the new 140 - Comet C/2019 Y4

 

https://www.cloudyni...tack-and-video/

 

WOW , really nice !

 

The more I see, the more I get convinced this will be my next telescope.

 

May I as what mount you are using ?

 

thanks

Mirko



#44 MirkoV69

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Posted 01 April 2020 - 03:20 PM

More first light work with the new 140 - Comet C/2019 Y4

 

https://www.cloudyni...tack-and-video/

 

WOW , this is very nice!

 

The more I see , the more I am convinced this will be my next purchase.

 

May I ask what mount are you using?

 

thanks

Mirko



#45 LRSibb

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Posted 01 April 2020 - 03:41 PM

WOW , this is very nice!

 

The more I see , the more I am convinced this will be my next purchase.

 

May I ask what mount are you using?

 

thanks

Mirko

I am using a DIY Hypertuned CGEM II.  The scope and instrument load is about 28 pounds.  With the OAG I am getting good enough guiding to image at full focal length especially with good seeing. 

 

Stars are sharp to edge of APS C size 071 chip - using the 2.5 inch flattener.


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#46 Der_Pit

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Posted 16 April 2020 - 05:01 PM

Yippieh, mine arrived without delays, despite Corona Lockdown!.

 

I thought it would be huge, but no, it isn't.  Its HUGE!  My (old) Stowaway looks like a better finder next to it smile.gif 

TS does a collimation check and delivers it with a star- and ronchi test.  Really nice.  Can't wait to put it out for some first light, but weather is bad.  Hopefully next week....

 

I noticed it even has two rotators.  One after the main tube, that allows to rotate the focuser unit, and one after the focuser, to rotate the camera.  This means I should be able to freely place the focuser and focusing motor to laterally balance filter wheel and guide camera....


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#47 Der_Pit

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Posted 18 April 2020 - 03:16 PM

I'm sure you'd like some more images?  None with the telescope (yet), but the clouds I live in currently had lowered for an hour or so, just enough to put it on the pier, check how it moves, and take a photo:

 

p1120045.jpg

 

The CEM60 doesn't seem to have an issue with it (not that I'd expected that), but I should probably get some more weight, so I don't have to put it too far down.

I had almost hoped for a clear night, but just after that the humidity went up again.... bawling.gif

 

weather.png


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#48 patrickrebstock

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Posted 25 April 2020 - 11:39 AM

stoked to hear more reports on the use thanks for sharing!



#49 Der_Pit

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Posted 10 May 2020 - 04:16 AM

Hi guys,

 

sorry for the silence.  I'm having some issues.  Not with the telescope - that really is a dream.  But my site is quite windy, and the increased weight (13.7kg with all equipment) and length of the OTA make it really sensitive to that.  So I had to hope for days without wind or look into wind shielding....

 

I think I'm on a good track with that now, and managed to get a run on M3 with 180 30s images, and guiding (total) RMS of ~0.54" and RA/DEC performance.  Only Blue channel for now, and this is only the live stacking image (asinh stretched) without any sort of rejection (but dark+flat corrected).  I hope you like it despite the missing color (I do smile.gif )

 

M3_B_livestack.jpg


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#50 Der_Pit

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Posted 20 May 2020 - 11:33 AM

Another teaser from this absolutely great telescope:

ASI1600MM-Pro, Astronomik RGB filters.  90s subs at gain 76, 70 per color = 5 1/4 hours total

 

M101_1600.jpg


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