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Author Topic: Wide field imaging - Williams Optics ZS71  (Read 5502 times)

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Offline DaveyW

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Wide field imaging - Williams Optics ZS71
« on: 14:08:41, 08 April, 2014 »
Hi Folks.

I currently run a LX90 but and ST80 as a guide scope.
What I'm looking to do is have a second scope for wide field imaging and would like some opinion on the WO ZS71. Will probably mount this scope piggyback on the LX90 and use one or the other for guiding and remove the ST80.

Does anyone have this scope, and / or recommend or give better alternatives?

Thanks
Dave

Online chris.bailey

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Re: Wide field imaging - Williams Optics ZS71
« Reply #1 on: 15:16:14, 08 April, 2014 »
Dave

The ZS71 is a nice little scope (I have an earlier incarnation) but really needs the Flattener 6 to get nice flat fields.

An alternative is the TS65 Quad which already has a flattener built in and will illuminate a decent sized chip to boot.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline Nomis Elfactem

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Re: Wide field imaging - Williams Optics ZS71
« Reply #2 on: 17:46:43, 08 April, 2014 »
A few of us have the TS65q Dave and whilst I haven't had chance to use it full anger yet due to weather/time I can highly recommend it. It's a lovely little scope with excellent colour correction and nice flat field and at focal length of 420mm it's a perfect widefield scope.

S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline Roger B

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Re: Wide field imaging - Williams Optics ZS71
« Reply #3 on: 19:01:08, 08 April, 2014 »
I had the ZS70 for a while & really liked it but as said it needs a flattener or reducer/flattener.   I did have to play around with spacer to get it right.

Now I have the Ts65q & with the built in flattener it's no problem.    If I had to choose now I'd go for the 65q.

Roger
Scopes - TS65q, W/O 110 Triplet
Mount - EQ6 PRO via  Eqmod,  Rowan belt modded
Cameras - SX694, QSI583WSG,Lodestar Guidecam, GP-Cam, QHY5II.
TS 9mm OAG
Quantum 7x1.25 EFW, Baader LRGB,Ha,OIII,SII Filters 
Quark chromo

SGPro, Pixinsight.

************AND NO TIME TO USE IT************

Offline DaveyW

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Re: Wide field imaging - Williams Optics ZS71
« Reply #4 on: 21:10:23, 08 April, 2014 »
Thanks folks. The advice is much appreciated. Just one other question. How do the focusers compare, and what options are you using for electric/remote focusing?
Thanks again
Dave

Offline Nomis Elfactem

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Re: Wide field imaging - Williams Optics ZS71
« Reply #5 on: 22:13:15, 08 April, 2014 »
Dave - I don't currently have a remote focuser attached but having just had a look at the focuser I'm pretty certain that my SharpSky (kit) focuser (see banner below !) will fit no problem with a suitable bracket !

S.
Simon

Scopes: Astro-Tech AT-111EDT Triplet, TS65ED Quad, Orion ST80, Modded PST-90 Solar Scope, PST Cak (on loan)
Cameras: SXVF H694, Atik 16ic, Canon EOS 600d, DMK41, DMK21, QHY 5L-II (mono & colour)
Accessories: SX USB Filter Wheel, SX OAG, Baader LRGB Ha SI OII Filters, SharpSky Focuser
Mount: EQ6 (EQMOD), SW Star Adventurer, plus a lot (and I mean a lot) of other bits and pieces

Offline Dave.M

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Re: Wide field imaging - Williams Optics ZS71
« Reply #6 on: 14:22:18, 10 September, 2014 »
I have used my ZS 71 for imaging and the results are first rate with excellent contrast. As already stated get the field flattener/focal reducer though. The focuser is very good. you will not be dissapointed. Everyone in my society that has looked through mine has been very impressed and at least one has now got one with others considering it.

Offline Roger B

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Re: Wide field imaging - Williams Optics ZS71
« Reply #7 on: 14:27:36, 10 September, 2014 »
The Ts has the R&P focuser & takes the weight of my SXVH9, Electric filter wheel & QHY5 no probs.  Also has the Sharpsky electric focuser. 

Roger
Scopes - TS65q, W/O 110 Triplet
Mount - EQ6 PRO via  Eqmod,  Rowan belt modded
Cameras - SX694, QSI583WSG,Lodestar Guidecam, GP-Cam, QHY5II.
TS 9mm OAG
Quantum 7x1.25 EFW, Baader LRGB,Ha,OIII,SII Filters 
Quark chromo

SGPro, Pixinsight.

************AND NO TIME TO USE IT************

Offline afm038

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Re: Wide field imaging - Williams Optics ZS71
« Reply #8 on: 22:11:19, 10 September, 2014 »
I had a look at the TS65Q some time ago but was put off by several people having star image quality problems due to pinched optics especially during cold weather and the fact that Ian King returned his stock of this scope due to said problems. I have not followed this scope for some time so I'm wondering if now the pinched optics issues have been fully resolved ?
A bit more expensive but any comments on the WO Star 71 5 element scope would be appreciated.

Andy

Online chris.bailey

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Re: Wide field imaging - Williams Optics ZS71
« Reply #9 on: 22:16:54, 10 September, 2014 »
Andy

I think the pinched optics on the 65Q are long since solved and I have not heard of recent issues.

The initial run of images I have seen from the W/O Star 71 are very very promising though it is a little short on back focus for a full rgb/mono CCD setup especially if an OAG was added to the mix.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline afm038

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Re: Wide field imaging - Williams Optics ZS71
« Reply #10 on: 22:35:16, 10 September, 2014 »
Thanks Chris,

Based on that I'll now have another think about the TS65Q.

Now you have highlighted it I'll also take another look at the WO back focus drawing on Ian Kings site and see if it's enough for my 383/SX wheel/OAG combo.

Andy

Online chris.bailey

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Re: Wide field imaging - Williams Optics ZS71
« Reply #11 on: 08:25:21, 11 September, 2014 »
Andy

66mm with the M48 coupling which I think works OK with the Atik/SX combo as its a little less than the same Atik Components. My Atik 383/OAG/EFW2 setup measures nearer 70mm by the time you factor in the various adapters. The W/O does have an M65 coupler though which gives a little more backfocus.

Chris
LX200|ZS70|FSQ85|FLT110|Altair DF250RC|EQ6 Pro(Rowan Belt Mod)|ParamountMX
ATIK383L+/EFW2/OAG|Lodestar|Baader 36mm LRGBHaSIIOIII
Starlight Express SXVRH16/ONAG/FW|Lodestar X2|Baader 2" Filters
Starlight Express SXVRH814/ONAG/FW|LodestarX2|Baader 2" Filters
Lunt LS60PTBF1200|DMK41|Quark Chromo
Samyang 135mm f1.8

Offline afm038

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Re: Wide field imaging - Williams Optics ZS71
« Reply #12 on: 20:04:53, 11 September, 2014 »
Chris,

I've measured my system and the SX FW + OAG + adaptors has a back focus is 44mm, so along with the quoted Atik 383 back focus of 17mm I have a total of 61mm, well within the 66.4mm quoted for the WO. A 5mm extension ring plus a 0.5mm fine tuning ring between scope and OAG would therefore give the correct distance.

Andy

 

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