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Equipment Discussions >> Cats & Casses

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budman1961
Pooh-Bah
*****

Reged: 02/25/11

Loc: Springfield, MO
Re: Meade's new LX800... new [Re: budman1961]
      #5171199 - 04/13/12 09:58 PM

Nevermind....here is is:

Secondary obstruction (%) 20.95 (10") 16.86 (12") TBD (14") NA (APO)

Andy


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budman1961
Pooh-Bah
*****

Reged: 02/25/11

Loc: Springfield, MO
Re: Meade's new LX800... new [Re: budman1961]
      #5171204 - 04/13/12 10:01 PM

And its a pretty good read to boot!

Andy


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frebieAdministrator
Chief assistant to the assistant chief


Reged: 04/29/08

Loc: Neither here nor there.
Re: Meade's new LX800... new [Re: budman1961]
      #5171333 - 04/13/12 11:50 PM

Some LX800 scopes started shipping from Meade today.

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mmalik
Post Laureate
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Reged: 01/13/12

Loc: USA
Re: Meade's new LX800... new [Re: EddWen]
      #5171422 - 04/14/12 01:34 AM

Quote:

Does your number for Secondary Mirror Obstruction take the baffle diameter into account?




Tough question; my calculations were derived from specs provided by Meade. I hope they would have taken baffle into account.


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mmalik
Post Laureate
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Reged: 01/13/12

Loc: USA
Re: Meade's new LX800... new [Re: rmollise]
      #5171426 - 04/14/12 01:38 AM

Quote:

There is likely no reason to "calculate." I expect the secondaries to be about what they were in teh RCX 400s.





I would think so too. But I looked at RCX manual; there is no mention of secondary mirror obstruction in specs section or for that matter in entire RCX manual.


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mmalik
Post Laureate
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Reged: 01/13/12

Loc: USA
Re: Meade's new LX800... new [Re: mmalik]
      #5172038 - 04/14/12 01:11 PM

Strange recommendation on page 26:

"If you are using a very heavy OTA, near the 90 pound limit of the LX800’s capacity, it may prove difficult to find materials of sufficient rigidity to prevent differential flexure. If this is the case, you can improve performance by attaching the StarLock to the top of your OTA."


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Meade's new LX800... new [Re: mmalik]
      #5172184 - 04/14/12 03:00 PM

Quote:

I would think so too. But I looked at RCX manual; there is no mention of secondary mirror obstruction in specs section or for that matter in entire RCX manual.





You can find the figures from several sources. If I recall, it runs about 40%...


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JSnuff1
sage


Reged: 12/29/04

Loc: NY
Re: Meade's new LX800... new [Re: rmollise]
      #5172454 - 04/14/12 06:03 PM

Are only the scopes shipping? Anything on the mount yet?

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Griffin!
sage


Reged: 09/12/10

Re: Meade's new LX800... new [Re: JSnuff1]
      #5172480 - 04/14/12 06:26 PM

I think he means both are shipping. The LX800 is the mount/ota combo.

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mmalik
Post Laureate
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Reged: 01/13/12

Loc: USA
Re: Meade's new LX800... new [Re: jrcrilly]
      #5173131 - 04/15/12 05:43 AM

Quote:

That's the most complicated scheme I've seen yet for this calculation.
Try this:
by diameter: 4.58/10 = .458 = 45.8%
by area: .458 X .458 = .210 = 21%




Thanks; your 'by area' method is new to me. But nice addition to the repertoire of the ways it could be calculated.


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Hilmi
Post Laureate
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Reged: 03/07/10

Loc: Muscat, Sultanate of Oman
Re: Meade's new LX800... new [Re: mmalik]
      #5173135 - 04/15/12 05:49 AM

To me, the area method makes more sense. After all, it is the area which affects resolving power

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kbastro
scholastic sledgehammer
*****

Reged: 04/20/08

Loc: Running from Clouds
Re: Meade's new LX800... new [Re: Hilmi]
      #5173249 - 04/15/12 08:28 AM Attachment (129 downloads)

speaking of lx800 here is one in action!
I got to play with one for a bit in the field to see what it was like!
kb


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rmollise
Postmaster
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Reged: 07/06/07

Re: Meade's new LX800... new [Re: Hilmi]
      #5173354 - 04/15/12 09:37 AM

Quote:

To me, the area method makes more sense. After all, it is the area which affects resolving power




Area = light gathering.
Diameter = contrast effects.

Most people are more concerned about the latter.

The loss of light gathering is rather minimial. Contrast? That depends...and depends on who you talk to.


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: Meade's new LX800... new [Re: kbastro]
      #5173356 - 04/15/12 09:39 AM

Quote:

speaking of lx800 here is one in action!
I got to play with one for a bit in the field to see what it was like!
kb




OK...what was it like? Enquiring minds want to know.


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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Meade's new LX800... new [Re: rmollise]
      #5173513 - 04/15/12 11:21 AM

Are you under orders to keep its wonderfulness concealed from the general public?

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Meade's new LX800... new [Re: herrointment]
      #5173516 - 04/15/12 11:22 AM

The sound man....what does it sound like???????

No three word answers allowed BTW.


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Hilmi
Post Laureate
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Reged: 03/07/10

Loc: Muscat, Sultanate of Oman
Re: Meade's new LX800... new [Re: herrointment]
      #5173909 - 04/15/12 03:17 PM

I does have the look of a very finely made home built mount. So many different materials and a mishmash of colors. They could do with a more harmonious color scheme. It looked alright in the pre-rendered images, even striking at first. But looking at an actual photo makes it look less flattering.

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kbastro
scholastic sledgehammer
*****

Reged: 04/20/08

Loc: Running from Clouds
Re: Meade's new LX800... new [Re: rmollise]
      #5173978 - 04/15/12 04:16 PM Attachment (120 downloads)






OK...what was it like? Enquiring minds want to know.




The one in the pic taken by me belongs to Jack Newton,, (the man holding the hand control) while working on a new dome at his place for a 20" f/4 folded Newtonian we got talkin' about meade's new mounts... low and behold not 3 seconds went by and he looked at me and said "you wanna see the 800?" My eyes widened a bit and said YES!

Slewing the new 800 around abit was just like slewing a CGE Pro mount,, the slews were good but a bit wavy or in pulses with the same type of wining sound... I personally like the slews better on a Titan and AP 900 mount better.

The hand control is identical to most other meade's better mounts and this mount Jack is testing had a 5" Apo on and due to time constrains I never got to see the autoguider/starlock in action.... BUT the mount runs quiet when not high speed slewing,,, the screw weight is of a neat design,, the unit has a hefty build,, though I DID NOT grab the mount by the counterweight shaft and check it for play..
I saw the blueish 10" f/8 ACF tube on the ground in his house and asked if he had tested that too,, he then looked me in the eye and said "the optics on that 10" are outstanding, if they (Meade) releases all the f/8's like the one they sent me for testing, then they will have a very good ota on their hands".

conclusion;
I wish I had more time to play with the system but intial seeing and listening to the mount it behaves very close to a CGE Pro, it is a solid mount when I grabbed the tripod slews are quick, and the mount is nice and sharp looking except this one covered in dust! I am including one more shot of the mount to show you it's size compared to the ME mount with a 14"sct.



kb


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Steven
sage
*****

Reged: 01/06/04

Loc: Ontario, Canada
Re: Meade's new LX800... new [Re: kbastro]
      #5174009 - 04/15/12 04:40 PM

Is it made from all machined or cast aluminum? Or a combination of both.

Steven


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mmalik
Post Laureate
*****

Reged: 01/13/12

Loc: USA
Re: Meade's new LX800... new [Re: rmollise]
      #5174052 - 04/15/12 05:08 PM

Quote:

To me, the area method makes more sense. After all, it is the area which affects resolving power




Quote:

Area = light gathering.
Diameter = contrast effects.

Most people are more concerned about the latter.

The loss of light gathering is rather minimial. Contrast? That depends...and depends on who you talk to.




My take is ‘area & diameter methods of calculation’ and ‘light gathering & contrast effects’ are more of an academic exercise; in the end, on a given OTA, you get the same number of photons on to your retina or sensor whether you refer to it as light gathering & contrast effect.

It is the obstruction size (however you refer to it, area or diameter) that matters!


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