ICEINSPACE
Most Read Articles
Moon Phase
CURRENT MOON Waxing Gibbous
98%
The Sun Now
Time Zones
Sydney*
7:45 pm
Perth
4:45 pm
Auckland*
9:45 pm
New York*
4:45 am
Paris*
10:45 am
GMT
8:45 am




Go Back   IceInSpace > Equipment > Equipment Discussions

Reply
 
Thread Tools Rate Thread
  #21  
Old 29-11-2017, 11:35 AM
bigjoe (Joe)
Registered User

bigjoe is offline
 
Join Date: Nov 2010
Location: sydney
Posts: 1,143
Quote:
Originally Posted by glend View Post
Just noticed that Andrews has a note posted concerning the arrival of a Skywatcher ED150, 1200mm (f8) fl APO due in late January. Of course, Skywatcher has had an old 150/1200 Achtomat for many years, but the Andrews website says its an Apochromatic. An internet search fails to uncover any news concerning this type of scope, and the Esprit 150 APO is a f7 triplet using FPL-53 glass.
Is this simply an advertising mistake in describing the Esprit or is there actually a 150 m f8 APO coming as well (maybe a Doublet version)?
Keeping my fingers crossed then Glen..As a predominantly visual observer of Doubles,Planets and planetaries, a good doublet Apo would do me ..with good glass at F8..otherwise I may very well get a TS scope or APM..There all fabulous these days and a test report above .95 Strehl included by Marcus Ludes !
Cheers bigjoe
Reply With Quote
  #22  
Old 30-11-2017, 09:38 AM
Camelopardalis's Avatar
Camelopardalis (Dunk)
Drifting from the pole

Camelopardalis is offline
 
Join Date: Feb 2013
Location: Brisbane
Posts: 4,336
That US guy certainly has some bite I think he’s trying to breed some confidence into the brand, after all Skywatcher doesn’t have the brand presence and reputation that they do like in, say, Europe. I think it’s a bit of a reach to suggest that the US is “by far” their biggest market...maybe within the family of companies, but not SW specifically.

Skywatcher should certainly be able to produce the goods, the Esprit 150 is a fire cracker and grinding a f/8 shouldn’t present much of a challenge.

The price is mighty tempting...but I couldn’t bring myself to image at f/8, so someone here needs to buy one and experiment with what reducers work well
Reply With Quote
  #23  
Old 30-11-2017, 09:59 AM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie, NSW
Posts: 4,756
Had an email back from Luke (at Andrews), he says Tasco is trying to get objective details from Synta. He offered that the second element is likely not Lanthanum, given the local price point.
So what does that leave us? If you believe the Skywatcher guy on CN, its not FPL-53, and probably no Lanthanum either.
It will be interesting to see what eventually comes out on this scope.
Reply With Quote
  #24  
Old 03-12-2017, 08:50 AM
Tropo-Bob (Bob)
Registered User

Tropo-Bob is offline
 
Join Date: Sep 2013
Location: Cairns
Posts: 766
Astropetes is now advertising these for $2795.

The details of this scope will be interesting, however, I think some will be disappointed. The scope looks like the Black Diamond Achromat with an ED lens. It appears to lack many of the nice features normally associated with topline apochromatic telescopes. However, this is consistent with the Skywatcher ED range and for the price, it appears to be fantastic value for money.

I look forward to seeing user reviews rolling in next year.
Reply With Quote
  #25  
Old 03-12-2017, 11:19 AM
Camelopardalis's Avatar
Camelopardalis (Dunk)
Drifting from the pole

Camelopardalis is offline
 
Join Date: Feb 2013
Location: Brisbane
Posts: 4,336
So long as interested buyers understand that it’s the big daddy of the BD range, I don’t see a problem.

We do, after all, get what we pay for.

It’ll certainly be interesting to see how it develops, as a 6” ‘frac that’s well corrected for that money is certainly new territory. With a reducer and a little customisation (i.e. motorised focuser), it could make for a killer imaging scope for the price...
Reply With Quote
  #26  
Old 03-12-2017, 02:06 PM
Tinderboxsky's Avatar
Tinderboxsky (Steve)
I can see clearly now ...

Tinderboxsky is offline
 
Join Date: Feb 2012
Location: Tinderbox TAS
Posts: 568
If it is as well corrected as the ED120 then it has the potential to be an outstanding visual scope for the price too. I have a preference for well corrected doublets over triplets for visual. They have less glass, less weight and the very marginal improvement (for visual) is not worth the step up in price for a triplet.
Reply With Quote
  #27  
Old 03-12-2017, 03:05 PM
MortonH's Avatar
MortonH
Deprived of starlight

MortonH is offline
 
Join Date: Nov 2006
Location: Sydney
Posts: 3,052
I was in Bintel today and they had hard copies of the Skywatcher 2018 catalogue. Nothing different from the PDF on the Skywatcher website but it was nice to see the same info, er... 'confirmed', in a proper glossy booklet.
Reply With Quote
  #28  
Old 03-12-2017, 10:53 PM
toc's Avatar
toc (Tim)
Registered User

toc is offline
 
Join Date: Mar 2006
Location: Mill park, Victoria
Posts: 658
So what would the main advantages be of this scope over something like the Skywatcher MN190 scope?
Reply With Quote
  #29  
Old 04-12-2017, 06:01 AM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie, NSW
Posts: 4,756
Quote:
Originally Posted by toc View Post
So what would the main advantages be of this scope over something like the Skywatcher MN190 scope?
Well at present the ED150 is an unknown, other than rough specs like focal length. At 1200mm fl it is longer than the MN190, but optically slower at f8 verses f5. It is unclear if the ED150 will be a good imaging scope. It is a Doublet objective type refractor, the MN190 is a corrected, flat field, Mak-Newt. The MN190 works as both a visual and imaging scope right out of the box, you will need to buy bits to make the ED150 a good imager (assuming that optically it is well corrected), it would need a field flattener, or reducer corrector at the very least. They are very different optically, and budget wise.
Reply With Quote
  #30  
Old 04-12-2017, 06:35 AM
Kunama
.

Kunama is offline
 
Join Date: Sep 2012
Posts: 3,499
My guess would be that it will have glass from Chengdu. One thing for sure, it will be a BIG scope, given that the dew shield will not retract, expect something around 1350mm OTA length....

It is going to need a decent mount to control the moment arm of such length and to counter any breeze that should blow on it.

I think my money would be going to the APM 152F7.9 FPL51 doublet instead.
Reply With Quote
  #31  
Old 04-12-2017, 10:20 AM
LewisM's Avatar
LewisM
Novichok test rabbit

LewisM is offline
 
Join Date: Aug 2012
Location: Somewhere in the cosmos...
Posts: 8,360
Quote:
Originally Posted by Kunama View Post
I think my money would be going to the APM 152F7.9 FPL51 doublet instead.
And there is one of them in the trader right now - APM and Lunt ones are the same (and close by...Hmmmmm)
Reply With Quote
  #32  
Old 04-12-2017, 10:57 AM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie, NSW
Posts: 4,756
Quote:
Originally Posted by LewisM View Post
And there is one of them in the trader right now - APM and Lunt ones are the same (and close by...Hmmmmm)
And the second objective element is Lanthanum. Price has been dropped as well.
Reply With Quote
  #33  
Old 04-12-2017, 11:10 AM
FlashDrive's Avatar
FlashDrive (Col)
Senior Citizen

FlashDrive is offline
 
Join Date: Apr 2008
Location: Brisbane North
Posts: 3,623
Quote:
Originally Posted by Saturnine View Post
but that's a lot of pension cheques.

+1 for me to ....
Reply With Quote
  #34  
Old 08-12-2017, 10:20 AM
Tropo-Bob (Bob)
Registered User

Tropo-Bob is offline
 
Join Date: Sep 2013
Location: Cairns
Posts: 766
I notice that that 150mm Achromat is not listed in the 2018 Skywatcher Catalogue. I assume the reality is that demand for the large achromat will fall away when the ED scope becomes available.
Reply With Quote
  #35  
Old 10-12-2017, 11:59 AM
bigjoe (Joe)
Registered User

bigjoe is offline
 
Join Date: Nov 2010
Location: sydney
Posts: 1,143
Quote:
Originally Posted by skysurfer View Post
This one at TS?
But it costs EUR 5200, a lot more, about A$7500. But this one is FPL-53.
Thats the triplet Fpl53..This is going to be a doublet..which weve heard not much about ..what glass is going to be used at F8, needs to be better than Fpl51 or equivalent ..may be ok for visual though.
..someones got to Beta test it when it comes out
bigjoe.
Reply With Quote
  #36  
Old 19-12-2017, 06:42 PM
JimsShed's Avatar
JimsShed (Jim)
Registered User

JimsShed is offline
 
Join Date: Jan 2015
Location: Bellbowrie
Posts: 141
We could speculate that it will have Hoya FCD100 like the new Saxons

http://www.astroshop.com.au/products...p?id=MAS-045I7
Reply With Quote
  #37  
Old 19-12-2017, 07:18 PM
glend (Glen)
Registered User

glend is offline
 
Join Date: Jun 2013
Location: Lake Macquarie, NSW
Posts: 4,756
There is an interesting article here,

https://www.altairastro.com/ed-glass...formance..html

Comparing glass types and optical performance. It seems to peg the FCD100 Abbe number a little below FPL-53, but its much better than FPL-51.

As always the element it is partnered with, doublet or triplet design, etc all play a role in final performance. What can be acceptable visually may not be acceptable for imaging. Much of the discussion of the new crop of 150mm ED refractors on CN, is being led by guys that want it for visual use. It's going to be very hard to convince imagers that anything less than an equivalent of a FPL-53 triplet is going to be good enough for serious imaging.

I would find claims of FCD100 superiority to Flourite Abbe number to be pretty far fetched without diagrams to support that design.
Reply With Quote
  #38  
Old 06-01-2018, 09:54 AM
Tropo-Bob (Bob)
Registered User

Tropo-Bob is offline
 
Join Date: Sep 2013
Location: Cairns
Posts: 766
This new scope really had me thinking about the limits of refractors for us hobbyists. To increase in size again, above the 1200mm FL and large tube diameter for the 150mm scope, as well as the increasing difficulty in making quality lens for large sizes suggests some limits, or at least some rapidly shrinking diminishing returns on the money spent.

Pity, because I used the now defunct, Oddie telescope at Mt Strombo once, loved the experience and I still desire to have a really large refractor. However, at the larger sizes, other designs are more affordable, and even arguably better. So, I suspect, this is possibly as large as a reasonable quality, mass produced (and affordable to the most people) refractor will go.
Reply With Quote
  #39  
Old 06-01-2018, 07:26 PM
Wavytone (Nick)
BigBanger

Wavytone is online now
 
Join Date: Jul 2008
Location: Killara, Sydney
Posts: 3,225
Bob I too spent many Monday nights in the 70s with the Oddie, originally thanks to Ed Simmonds and before it was made accessible to others apart from the postgrad students at the observatory. While it was great for insane magnifications on the planets when seeing permitted it’s focal ratio made it pretty hopeless on DSOs. The little plate camera was ok but mainly for teaching the basics of plate photography for those who hadn’t learnt it in their undergrad course. I even used it as a guidescope with an 8” newtonian bolted on to take photos on several occasions.

But it really was a museum piece.

This may seem heretical to many here, but last year I put the refractor hype to the test with star tests on same objects through an assortment of three APOs 130-150mm side by side with a C6 a good 8” dob and my SW mak. The APOs included an AP Starfire 130 GT... nice scope but compared to the reflectors the only conclusion I came to is that the refractors are “try-hard wannabes” when it comes to real achromatism. As for resolution... sorry refractor guys, the 7” SW mak won every time and it matched them for contrast.

This was enough to wean me off refractors for good as the 7” mak won every comparison.

A 9” mak or SCT is about as big as I can lift and a 9” premium modern mak IMHO surpasses what the Oddie was able to do in every respect. A good 10” or 11” SCT ditto.

Last edited by Wavytone; 06-01-2018 at 07:40 PM.
Reply With Quote
  #40  
Old 06-01-2018, 10:05 PM
raymo
Registered User

raymo is offline
 
Join Date: Sep 2011
Location: margaret river, western australia
Posts: 4,402
Well I don't find it heretical; Since getting my first proper scope [as opposed to a toy one] in 1952, I have either owned or used, scopes of many types
and sizes, and I have to say that I agree with Wavytone 100%. Oddly, I
have only ever had two Maks, a 6 and a 7, and both of them split
Antares more cleanly and aesthetically pleasingly than any other
amateur scope of similar, or even a little larger, size that I have ever used.
The SW 6" was especially good value for money.
raymo
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 06:45 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Advertisement
OzScopes Authorised Dealer
Advertisement
FLI Cameras and Imaging Accessories
Advertisement
SkyWatcher WiFi Adaptor
Advertisement
SkyWatcher 2018 Catalogue
Advertisement
Interest Free Finance
Advertisement
Bintel
Advertisement
Lunatico Astronomical
Advertisement
NexDome Observatories
Advertisement
Atik Horizon
Advertisement
Astronomy and Electronics Centre
Advertisement