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Review: William Optics Star 71

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#51 nodalpoint

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Posted 05 September 2014 - 02:15 PM

There's a cut-away diagram from the Agena Astro site:

 

wo-star71-6s_1.jpg


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#52 zsb04

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Posted 05 September 2014 - 07:46 PM

first light with the scope. m31 andromeda galaxy 18x 120seconds unguided at iso 800 using a cannon eos t3i. I only managed 5 darks at the end, then the camera battery died :(  4th ever attempt at astrophotography and my best one yet, Only issue i have with the scope is the tube rotates pretty easily within the rings, even when clamped down, i am thinking some extra felt will help? any ideas?

Attached Files


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#53 zsb04

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Posted 05 September 2014 - 07:49 PM

also, is it just me or are the stars on the left of the image blue and as it transitions to the right they are red?  that can't be right lol



#54 Denimsky

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Posted 05 September 2014 - 08:31 PM

Thank you for the information Timm and nodalpoint.

 

Is there anyone using this scope with a full frame 35mm size camera?



#55 Orion58

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Posted 14 September 2014 - 08:57 AM

 Only issue i have with the scope is the tube rotates pretty easily within the rings, even when clamped down, i am thinking some extra felt will help? any ideas?

 

Yes, that's all you need.



#56 xb39

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Posted 06 October 2014 - 07:49 AM

Hi,

as I'm still collecting photons for my first light with the WO Star-71 it was a welcome relief to make some picture of the moon and the sun in white light. This was also my first light at sun and moon.

 

I started with my full frame DSLR Canon EOS 6D (ISO 100, 1/2000s / stacked 15 out of 25 ):

 

get.jpg

 

Taking into account that the FOV of the scope attached to my Alccd5L-IIm is ideal for imaging the whole sun (or moon). Here are some pictures (1280x960):

 

get.jpg (600 out 1000 frames stacked)

 

get.jpg (Area of 320x240)

 

And here is a lucky shot of a plane (animated gif):

 

get.jpg

 

After this imho very promising first sun light I did some improvements (use of green filter and UV/IR cut filter, flat and dark substraction). Here are the results:

 

get.jpg (1280*960, 1400 frames stacked)

 

get.jpg (320x240)

 

 

And here is a picture of the moon:

 

get.jpg (1280*960, 600 frames stacked

 

The details for a scope with 348 mm focal length are not that bad taking into account that the Alccd5L-IIm works not at its optimum regarding f-stop (undersampled).

 

O.K., this is really not the scope was made for but if you have only cloudy nights during deep sky imaging you can try something fully different ;)

 

Best regards

Stefan

 



#57 OrionSword

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Posted 18 October 2014 - 10:46 AM

I was able to recently get first light in Ha with 4x10minute frames before clouds became attracted to the scope.  This is the area around M52 with the Bubble nebula.--Added 7 more subs to it last night, now 11x10min.

Attached Files


Edited by OrionSword, 20 October 2014 - 05:13 PM.

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#58 lakeorion

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Posted 21 October 2014 - 02:23 PM

Owners - If one were to fit a film solar filter on the front, what diameter would one choose?  Or, what is the OD of the dew shield?



#59 OrionSword

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Posted 21 October 2014 - 05:14 PM

Owners - If one were to fit a film solar filter on the front, what diameter would one choose?  Or, what is the OD of the dew shield?

 

93mm OD.



#60 OrionSword

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Posted 22 October 2014 - 06:24 AM

Here are the curvature and tilt measurements.  Slight tilt favors the bottom at 180deg.  The two brass screws on the top of the focuser are set soft, so they still have some tweak room in my case.  I have about a 4# load on my focuser with a ST8300m and  Starlight Express 5x2" filter wheel.

 

 

Attached Files



#61 OrionSword

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Posted 22 October 2014 - 06:28 AM

Here is the flat analysis.  Light fall off fairly slight and at most 6% in corners of the KAF8300 chip with 2" filters in service.

Attached Files


Edited by OrionSword, 23 October 2014 - 06:11 AM.


#62 bjgiii

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Posted 22 October 2014 - 05:57 PM

I'm using a dslr with my scope. Are these scopes limited to a clip in filter like the ones manufactured by Astronomik for a dslr? Or are there other mounting options for a filter?



#63 gatsbyiv

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Posted 22 October 2014 - 06:24 PM

I'm using a dslr with my scope. Are these scopes limited to a clip in filter like the ones manufactured by Astronomik for a dslr? Or are there other mounting options for a filter?

 

There is internal threading for a 48 mm filter.  timmbottoni posted some images of this on the second page of this thread.  



#64 zsb04

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Posted 22 October 2014 - 09:48 PM

here is my second try at m31 using star71, much more detail and much more integration time

http://www.astrobin.com/122697/








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