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Sharpstar 94mm f/5.5 ED Triplet Apo - First Impressions

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47 replies to this topic

#26 Cbaxter

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Posted 09 December 2020 - 11:08 PM

That's good to know about your images posted here. Very nice images and from the looks of them the scope is controlling CA very well.

Thanks!

#27 Stevan Klaas

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Posted 10 December 2020 - 01:10 AM

I’ll have to get one, or a reducer/flattener 😒


Just purchased the 0.80 edph reducer/flattener....

Stevan

#28 StarAlert

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Posted 10 December 2020 - 01:29 AM

That's good to know about your images posted here. Very nice images and from the looks of them the scope is controlling CA very well.

Thanks!

Here's a 60 second sub of M37 with just the IR/UV cut.

M37 60sec UV/IR Cut
 
My spacing might be off by a half mm or so, right now. I'm waiting for some spacers to show up so I can get the exact 58mm spacing between the reducer and the sensor. That obviously won't impact CA. 

Edited by StarAlert, 10 December 2020 - 01:34 AM.

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#29 StarAlert

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Posted 10 December 2020 - 01:41 AM

And here's another 120sec sub. This was taken nearer the zenith and you can clearly see the rotation on the edges due to the long exposure... I use an Alt Az mount. 

 

M45: 120sec sub 

M45 120sec 2020 12 09

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#30 Stevan Klaas

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Posted 10 December 2020 - 07:20 AM

Here is a jpg of a 8 x 180 sec integration, no flat, no bias, no dark.

Looks promising for a mag 17,92 sky.

Stevan

Attached Thumbnails

  • 42777EE8-64FE-4701-B6AE-8F2AA3DB7DD4.jpeg

Edited by Stevan Klaas, 10 December 2020 - 07:20 AM.

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#31 Stevan Klaas

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Posted 11 December 2020 - 02:09 AM

And here is a second light, ngc7023 in RGB (no luminance) of 35 x 180sec blue, 30 x 180sec green, and 10 x 180sec red, about 3h45 total.

No flattener, big field curvature ! Despite that, star colors have aligned quite well I must say.

Mag 17,80.

With bias, darks, flats.

Stevan

Attached Thumbnails

  • 6EAE0C24-6995-42ED-9DE4-485EF3ED6C6C.jpeg

Edited by Stevan Klaas, 11 December 2020 - 02:12 AM.

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#32 StarAlert

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Posted 11 December 2020 - 02:22 AM

And here is a second light, ngc7023 in RGB (no luminance) of 35 x 180sec blue, 30 x 180sec green, and 10 x 180sec red, about 3h45 total.

No flattener, big field curvature ! Despite that, star colors have aligned quite well I must say.

Mag 17,80.

With bias, darks, flats.

Stevan

Very nice images but I think you’re posting them in the wrong forum. These should be in deep sky imaging. 



#33 Stevan Klaas

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Posted 11 December 2020 - 03:32 AM

Very nice images but I think you’re posting them in the wrong forum. These should be in deep sky imaging.


Hi, it was supposed to show the very first images from the very first buyers of this new tube. So people can see how it performs with little integration time and under polluted skies.

In astrobin it’s difficult to find images for particular equipments...so itwas my contribution to the first impressions...

Sorry,
Stevan

#34 StarAlert

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Posted 11 December 2020 - 06:56 AM

Hi, it was supposed to show the very first images from the very first buyers of this new tube. So people can see how it performs with little integration time and under polluted skies.

In astrobin it’s difficult to find images for particular equipments...so itwas my contribution to the first impressions...

Sorry,
Stevan

My apologies. You’re absolutely correct.  I thought this was in the EAA forum. I keep going back and forth between the two forums and forgot where I was. Carry on! bow.gif


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#35 RobM

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Posted 15 December 2020 - 12:24 PM

For visual, how might this stack up against the Tak Sky90 or the Astronomics Astro-Tech AT92 f/5.5 Triplet Apo?  We all know Tak's rep for insanely good optics, but there was criticism of the Sky-90 for color at higher magnifications if the Extender Q 1.7X corrector (barlow?) wasn't used.

 

There seems to be a bit of mystery about the glass used, other than specifying 'ED elements...'  (That leaves a LOT of wiggle room)



#36 paul

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Posted 22 December 2020 - 12:38 AM

Hello,

So are the Sharpstar EDPH and the TS EDPH the same scope with different labels? 

Thanks 

Paul



#37 Wildetelescope

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Posted 22 December 2020 - 08:26 AM

And here's another 120sec sub. This was taken nearer the zenith and you can clearly see the rotation on the edges due to the long exposure... I use an Alt Az mount. 

 

M45: 120sec sub 

Wouldn’t you expect to see rotation across the field of view if it was the mount?  I would guess that is due to spacing of the focal reducer.   

 

Nice picture in any case:-).  

 

Cheers!

 

JMD



#38 StarAlert

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Posted 22 December 2020 - 09:40 AM

Wouldn’t you expect to see rotation across the field of view if it was the mount?  I would guess that is due to spacing of the focal reducer.   

 

Nice picture in any case:-).  

 

Cheers!

 

JMD

Hmmmm, I’m not sure. I only have this issue when I’m imaging towards Zenith. I’ll do a test the next time I get out. 



#39 StarAlert

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Posted 22 December 2020 - 09:41 AM

Hello,

So are the Sharpstar EDPH and the TS EDPH the same scope with different labels? 

Thanks 

Paul

I would guess so. 



#40 Stevan Klaas

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Posted 22 December 2020 - 07:12 PM

Hello,
So are the Sharpstar EDPH and the TS EDPH the same scope with different labels? 
Thanks 
Paul


They are more than suspiciously identical !

For me, at 99% probability, Sharpstar manufactures for TS and puts the TS brand. Then I don’t know if TS imposes any particular quality standard, only an insider would know that, but I doubt there is any difference.

Stevan
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#41 bruceosterberg

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Posted 02 January 2021 - 08:02 AM

Just purchased the Sharpstar 94 EDPH and also the 0.8X reducer/Flattener.  Should be here by Friday the 8th of January 2021.  It will be my second Refractor.

I will be using a ZWO EFW with Baader LRGB filters and some Antlia SHO filters for Narrowband, My imaging Camera is the ASI 183mm pro.

Looking at the back spacing diagram for this combination, ASI recommendation is 56MM Back focus, I say 56 because of the extra 0.7mm for the the filter.

I have different spacers to try out if it need a Plus or minus adjustment.  I'll let you know how this works out.  Sure looking forward to this telescope.

Bruce


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#42 Tulsa

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Posted 05 January 2021 - 03:30 PM

Here's a side by side of the two EDPH's.   What is the quality of the glass in these?

 

 

t83MPSLh.jpg

 

 

Larger



#43 rbrtgmn

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Posted 30 January 2021 - 03:17 PM

hi,

how did u reach 55mm back focus with this scope, 0.8reducer and asi294 but also a filter wheel?

i cant get it, the threads are not compatible and i had tried every combination with all my adapter

thanks

Edited by rbrtgmn, 30 January 2021 - 03:18 PM.


#44 25585

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Posted 30 January 2021 - 03:24 PM

Good news for UK, First Light Optics are selling this scope now, so no VAT hassles buying from abroad. I am quite interested in how it is for visual ane as a telephoto camera lens for daylight photography.



#45 rkille

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Posted 11 February 2021 - 04:31 PM

Had this scope a while now and still loving it.  Here is my full setup.

 

sharpstar94setup-small.jpg

Full Res here - https://rkille.com/g...star94setup.jpg

Some one was asking about backspacing with a filter wheel.  It is very easy. 

 

You just need to find the right spacers.  I usually use a variable spacer that lets you adjust from 9-14mm.

 

Something like this. https://agenaastro.c...sion-s-2v1.html

They also make ones in 42mm size.

 

I have so many different adapters I am not even sure where I got all of them or when.  But they are out there if you look for them.

 

I was even able to add both a ZWO filter wheel for my 2" filters and the Pegasus astro rotator at the same time and come close to the 55mm backspacing.  It goes just a bit over at 57mm, but images still look pretty good, I just have to crop the edges a bit.  But not really an issue for me with my APSC camera.  

 

Russell K.

genesisobservatory.org

Toledo, OH, USA

 

Here is my latest pict with the shapstar. https://rkille.com/genesis/piwigo/i.php?/upload/2021/02/11/20210211142406-d2a7f1d4-xx.jpg


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#46 Stevan Klaas

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Posted 12 February 2021 - 02:10 AM

Almost two months of bad weather, could not shoot my second light with it yet.

My setup waiting for Godot.
 

67A57736 4AE4 4083 A7EC 15E3DECD79A1
Album: Gear
1 images
0 comments

 


Edited by Stevan Klaas, 12 February 2021 - 02:18 AM.

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#47 Stevan Klaas

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Posted 18 February 2021 - 06:19 PM

Second light : finally got 1h20 of clear sky before new clouds arrived.

 

26 LRGB subframes of 180sec in bortle 8 skies, mag 17.88.

 

Stars are almost round to the corners. Seems fast.

 

Stevan

 

3EC80113 AC6E 4455 A302 DB9C7B8DECC8

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#48 Stevan Klaas

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Posted 22 February 2021 - 04:54 PM

Here is M31 with 4 hours integration time in LRGB. Bortle 8, mag 17.80 average.

 

M31 with Sharpstar 94EDPH



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