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LX850 M81 in mediocre seeing

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#51 bilgebay

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Posted 18 March 2013 - 10:50 AM


Pak, thank you for changing from bold green font back to normal characters. This is way better.

Yesterday was Saint Patricks day. You know, green? Leprechauns? Three leaf clovers?



Nope, I don't know. I am coming from a completely different culture and we do not observe St. Patrick's day here. Would you mind explaining what you mean by your statement above via PM for which I will be thankful to you. I know what a Leprechaun is but how a Lep fits into our context is not clear to me.

Thanks

Sedat

#52 Pak

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Posted 18 March 2013 - 11:15 AM

Pak, thank you for changing from bold green font back to normal characters. This is way better.

Yesterday was Saint Patricks day. You know, green? Leprechauns? Three leaf clovers?



Nope, I don't know. I am coming from a completely different culture and we do not observe St. Patrick's day here. Would you mind explaining what you mean by your statement above via PM for which I will be thankful to you. I know what a Leprechaun is but how a Lep fits into our context is not clear to me.

Thanks

Sedat


Yes I do mind. The reason I mind is that a moderator should not be taking sides in a discussion or argument. If I am violating the TOS of this forum then I should be privately reprimanded and asked to edit or delete the offending post.

This forum is hosted and sponsored by Astronomics. They are an American company. I too happen to be an American. Growing up here in the U.S. we make note of St. Patricks day and while some take it more seriously than others, it was common to make an attempt to wear green. Stores stock up on
things like corned beef and cabbage. People go out drinking . Kids build and set Leprechaun traps. In an increasingly secular society many of these things have gone by the way side. Since I am of Irish heritage I decided that my posts would be in green yesterday and my first few posts had a little Leprechaun at the bottom.

If people want to attack my spelling, punctuation, grammar and the color of my font, they are more than welcome to.

I didn't change back to normal text because I was asked, I changed back because the holiday was over.

#53 Hilmi

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Posted 18 March 2013 - 11:32 AM

Look, i didnt realize the green was related to a special occasion, my appologies.

#54 bilgebay

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Posted 18 March 2013 - 11:57 AM

The reason I mind is that a moderator should not be taking sides in a discussion or argument.



How do you reach this conclusion ?

And, Pak, I value reading your comments. But, for heavens sake, lose the green text and the undesirable tone



The statement I agreed to is above. There is one positive and one negative comment there. I don't see it as siding with anyone. If this is how you inferred it, then please believe me that it was not my intention.

I may be a moderator but I am a member too... and I value this more than being a moderator. Being a moderator isn't a reward or anything like that. I know this because I have been moderating several local forums since many years. It is a serious undertaking. In order not to add insult to the injury, I should be allowed to voice my opinion at least, don't you think so ? :)

Thank you for explaining the St. Patrick's Day habits. I agree with you that we are losing a lot of those old rituals no matter what society we are in.

Enough digression, let's go back to the original topic now.

Clear skies

#55 Phil Cowell

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Posted 18 March 2013 - 06:22 PM

Some of us wear orange on St Patricks Day :D
Phil

#56 Mantis707

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Posted 18 March 2013 - 06:30 PM

(should be responding to the post above , by Pak..., dont know how to fix that)

I have never opined one thing about this product...so I am not sure what opinion you are talking about.

I only posted in here to thank the people who were reviewing the products (who actually know about them and have used them)...no matter what their results, as I truly appreciate people doing that service for the rest of us.

#57 korborh

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Posted 18 March 2013 - 08:11 PM

Thank you for your opinion Pak. I appreciate someone who is not afraid to stand up against the majority. You may be right or you may be wrong. Time will tell. You were right in expressing your opinion, I can't say the same for a few others.


+1

#58 EFT

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Posted 19 March 2013 - 10:24 AM


Thank you for your opinion Pak. I appreciate someone who is not afraid to stand up against the majority. You may be right or you may be wrong. Time will tell. You were right in expressing your opinion, I can't say the same for a few others.


+1


+1

#59 DaveJ

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Posted 19 March 2013 - 03:50 PM


Thank you for your opinion Pak. I appreciate someone who is not afraid to stand up against the majority. You may be right or you may be wrong. Time will tell. You were right in expressing your opinion, I can't say the same for a few others.


+1


+1


-2

#60 Orionis91

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Posted 19 March 2013 - 04:55 PM

Dude that is such a nice picture!!!

#61 ahopp

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Posted 19 March 2013 - 10:07 PM

Jason, What are you using for mount control on the LX850? I plan on getting TheSkyX Pro w/Tpoint and Camera AddOn, unless you have another recommendation that I should consider.

Tony

#62 jimb1001

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Posted 20 March 2013 - 12:20 AM

You are certainly entitled to your negative opinion.
However, implying a poster is probably lying or deliberately misleading doesn't take more than one post.

#63 Mkofski

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Posted 20 March 2013 - 01:35 AM

You are certainly entitled to your negative opinion.
However, implying a poster is probably lying or deliberately misleading doesn't take more than one post.


+1

#64 freestar8n

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Posted 20 March 2013 - 03:52 AM

I think that if the intent is to convey that this scope/mount system is working well, then it would be much more informative to present quantitative performance metrics based on raw data rather than processed images.

This system, along with the earlier lx800, is I think unique in amateur astronomical imaging in relying on minimal flexure to image well in long exposures. When the guiding system is sold entirely separate from the main optics then it is up to the user to use OAG or an add-on guidescope - and to keep the flexure to a minimum. But in an integrated system the flexure is built in - and becomes an important specification that can be quantified in arc-seconds per minute.

I have battled flexure with sct's and consider it a key problem, along with centroid accuracy, that limits the results people get with reflective optics in long exposures - and I offer unique features in MetaGuide to allow the direct measurement of flexure in different parts of the sky so it can be quantified and methodically reduced.

Although people focus on the primary mirror as the culprit, an sct with its long focal length and magnifying secondary can have many sources of internal flexure, including even some distortion of the corrector plate holding the secondary.

The impact of flexure depends on the length of the exposure and the size of the stars in the image. For 4" fwhm and 5m exposures, they would start to look oblong at perhaps a flexure rate of 0.2" per minute - which is achievable. But for 2" fwhm in 10 minutes, it would be more like 0.04" per minute and that is much harder.

Regarding the "guiding accuracy" it is stated at something like "1 arc second." I'm not sure how that relates to the achievable fwhm. For example - if a skilled person with an expensive system is getting 2" fwhm - what would this system achieve? 3"? 4"? How does "1 arc second" translate to the penalty you get in guiding compared to a system guiding at the limits of seeing?

I don't know if anyone will state values for the flexure rate - but I sure hope they are measuring it and using it as a guide to improve the mirror locks or whatever. You can get it directly from a long series of guided images as long as you don't dither and you are polar aligned well. I personally would be measuring it all over the sky since the rate can be orientation dependent.

If they do solve flexure and end up with a system that can be used at long focal length for long exposure narrow band - that's great - and I'll be very interested to see how they did it. Even rc's and cdk's with fixed primaries and expensive mechanics tend to be guided with OAG - but there are exceptions.

Frank

#65 Whichwayisnorth

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Posted 20 March 2013 - 11:40 AM

Jason, What are you using for mount control on the LX850? I plan on getting TheSkyX Pro w/Tpoint and Camera AddOn, unless you have another recommendation that I should consider.

Tony


Meade has had the mount in the hands of a developer working on ASCOM drivers for about a month now. I am not sure how much longer before they are released however.

That having been said I have been told quite a few times that using the generic classic lx200 ASCOM drivers should work. You won't have full functionality but you will have the basics like go-tos.

The way that Starlock works you'll have to turn off the Starlock HPP if you are going to use t-point. Which is exactly what I'll do too. I must have a bad driver install because I've not been successful at getting the aforementioned ascom driver to work with The Sky X. I came up with a work around to get me by until the official drivers are released. I'll give it another shot though once my mount arrives.






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