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timps
sage


Reged: 02/24/13

Meade ACF Large CO.
      #5763206 - 03/28/13 09:18 PM

I have noticed that the secondary mirror on Meade SCTs
seem to be quite large.
The Celestron secondaries seem to be noticeably smaller than the Meade.
Does this mean that the 14" celestron will deliver more contrast than the 14" Meade?


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jrcrillyAdministrator
Refractor wienie no more
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Reged: 04/30/03

Loc: NE Ohio
Re: Meade ACF Large CO. new [Re: timps]
      #5763261 - 03/28/13 09:54 PM

I dunno. I've owned both and never noticed any contrast difference. Didn't notice any apparent difference in obstruction size either, but I never spent much time looking at that end.

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rcdk
super member


Reged: 11/13/10

Re: Meade ACF Large CO. new [Re: jrcrilly]
      #5763463 - 03/29/13 12:28 AM

If you are looking at the new F8 OTAs, then yes it is bigger. But they are aimed at the imaging market where the benefits of shorter focal ratio outweigh the negatives of larger CO.

The best contrast I have experienced was with my 6" F9.5 dob. Of course, the views in my 12" Meade blow it away no matter the target in spite of having a much larger CO.

There is probably more variation between individual scopes of the same brand than between the two brands on average.


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timps
sage


Reged: 02/24/13

Re: Meade ACF Large CO. new [Re: rcdk]
      #5763639 - 03/29/13 04:50 AM

Would you recommend the F10 Meade? They are still capable for photography and probably better then F8 for visual, don't you think?

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rcdk
super member


Reged: 11/13/10

Re: Meade ACF Large CO. new [Re: timps]
      #5763933 - 03/29/13 09:10 AM

I like my F10 scope, but I would try to look through both. The larger CO bothers me, but I have heard the F8 optics are excellent and give great views. Depending on the size of the scope, baffle arrangement, etc. the difference is probably more academic than the CO size suggests.

I have heard that Meade is planning on offering the ACF only in F8 when they run out of the F10.

For photography I would jump on the F8 OTA, especially if it gave good enough views.


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Spacetravelerx
Carpal Tunnel


Reged: 12/23/12

Loc: New Mexico
Re: Meade ACF Large CO. new [Re: rcdk]
      #5763991 - 03/29/13 09:27 AM

On the 14" the CO is only 13.8%. That is not bad at all.

Combined with the over sized mirror, optical design, coatings etc I think this will be a winner. People are already raving about it.


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rtanton
Vendor (Explorer Scientific)
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Reged: 02/06/07

Loc: Mission Viejo, CA
Re: Meade ACF Large CO. new [Re: Spacetravelerx]
      #5764085 - 03/29/13 09:55 AM

A data point of only one...but several years ago, while employed at Meade, we took both a 14" LX200GPS (f/10) and a 14" RCX (f/8) to Palomar to view Deep Impact. It was my opinion (as well as that of several others including some from OPT) that the impact may have been equal to or slightly more visible through the f/8 scope. Contrast was a key factor for seeing the impact visually.

Russ

Edited by rtanton (03/29/13 09:56 AM)


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jrcrillyAdministrator
Refractor wienie no more
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Reged: 04/30/03

Loc: NE Ohio
Re: Meade ACF Large CO. new [Re: rtanton]
      #5764103 - 03/29/13 10:06 AM

Quote:

A data point of only one...




I have another such single data point. Had a 12" RCX set up next to a well-collimated 12" GPS model a few years ago. Using eyepieces of the same design but of different focal lengths we matched up the magnification and FOV and scanned the Double Cluster for quite a while. All present agreed that the RCX was showing a few more of the dimmest stars.


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timps
sage


Reged: 02/24/13

Re: Meade ACF Large CO. new [Re: Spacetravelerx]
      #5766161 - 03/30/13 04:55 AM

13.28 according to Meades website. Even better! Supprising as it looks bigger than that on the pics.

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cn register 5
scholastic sledgehammer


Reged: 12/26/12

Re: Meade ACF Large CO. new [Re: timps]
      #5766209 - 03/30/13 06:44 AM

Isn't that the obstruction as a percentage of the area? If so it's about 36% of the diameter.

Chris


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Bill Barlow
Carpal Tunnel
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Reged: 12/03/07

Loc: Overland Park KS
Re: Meade ACF Large CO. new [Re: timps]
      #5767039 - 03/30/13 03:09 PM

I own a C14 and the secondary mirror housing is 4.5" in diameter. That calculates to about a 31-32% obstruction when compared to the 14" of clear aperture. Not sure of the Meade f/10, but the f/8 probably has something a little larger than the C14's 31-32%.

bill

Bill


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orion61

*****

Reged: 10/20/07

Loc: Birthplace James T Kirk
Re: Meade ACF Large CO. new [Re: Bill Barlow]
      #5771286 - 04/01/13 05:24 PM

BUT look at the Meade RCX series, the larger secondary doesn't have to mean worse images, the Meade RCX's were outstanding visually. perhaps a little less bright but compaired to when I got into Astrphotography todays 2 minute exposures are nothing. I used to sit still
for up to an hour, guiding..
I also walked in the snow to School. Up hill Both ways...


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thesubwaypusher
scholastic sledgehammer
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Reged: 07/08/04

Loc: New York City
Re: Meade ACF Large CO. new [Re: jrcrilly]
      #5814167 - 04/21/13 09:48 PM

Quote:

I never spent much time looking at that end.






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thesubwaypusher
scholastic sledgehammer
*****

Reged: 07/08/04

Loc: New York City
Re: Meade ACF Large CO. new [Re: rcdk]
      #5814188 - 04/21/13 09:52 PM

Quote:

If you are looking at the new F8 OTAs, then yes it is bigger.




I noticed that at NEAF.

Another thing that surprised me was the pebbled finish didn't seem to bother me as much this year.

I think it was the MEADE INSTRUMENTS sticker that diverted my attention.

That looks kind of kool.


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Bill Barlow
Carpal Tunnel
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Reged: 12/03/07

Loc: Overland Park KS
Re: Meade ACF Large CO. new [Re: thesubwaypusher]
      #5815664 - 04/22/13 04:37 PM

Did you ask Meade if they were ever going to bring back the smooth/glossy blue paint finish on their SCT's? I had one of the textured/pebble finished 12" ACF and didn't like it much, but now they have decals on them, so that might offer a better look than the naked tubes.

Bill


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thesubwaypusher
scholastic sledgehammer
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Reged: 07/08/04

Loc: New York City
Re: Meade ACF Large CO. new [Re: Bill Barlow]
      #5849224 - 05/09/13 02:45 AM

Hi Bill:

No, I didn't ask them, as I assume they are set on not making them anymore. In one of the other threads, you can see how Lenny's new scope looks a lot better with the decals. But as I sit here looking at my 12" glossy finish, I can't imagine having one of those textured jobs in my living room. It's just not as elegant. In the garage, okay...

I also dislike those goofy stars that they put on the forks. I was looking at them at NEAF and just wondering what Meade is thinking with these toy-like ETCHED emblems on serious scientific instruments that sell for thousands of dollars. It would actually prevent me from buying one.

Thanks, Chris


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Spacetravelerx
Carpal Tunnel


Reged: 12/23/12

Loc: New Mexico
Re: Meade ACF Large CO. new [Re: thesubwaypusher]
      #5849236 - 05/09/13 03:06 AM

Chris, et. al.,

I have had the blue glossy tube for a long time (10" LX200), however I like the new textured look of the LX850. I am fine with it in my living room, though (a) it is a bit huge for there, (b) I would rather have it outside or in an observatory!


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rcdk
super member


Reged: 11/13/10

Re: Meade ACF Large CO. new [Re: Spacetravelerx]
      #5849394 - 05/09/13 07:53 AM

I buy scopes to look through, not at.

As long as it isn't a maintenance problem, I don't care what the paint looks like.


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Whichwayisnorth
Pooh-Bah
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Reged: 07/04/11

Loc: Southern California
Re: Meade ACF Large CO. new [Re: rcdk]
      #5849884 - 05/09/13 11:54 AM

Supposed to reduce the appearance of finger prints and other smudges. Personally I think they couldn't get the factory down in Mexico or the body shop in TJ to paint without runs or dirt specs so they gave up and went with the rough finish. Just my opinion though.

Keep in mind that they have other tubes that are painted smooth gloss but I wonder if those are done in Mexico or China.

Edited by Whichwayisnorth (05/09/13 11:55 AM)


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nitegeezer
scholastic sledgehammer
*****

Reged: 11/27/07

Re: Meade ACF Large CO. new [Re: Whichwayisnorth]
      #5850114 - 05/09/13 02:15 PM

I guess I would have to agree with rcdk. My scope sits in the case when it is not in use. I would not care if it was hot pink with runs all down the sides. As long as it functions well then I am happy.

Having said that, my opinion has changed over the years. Since the first thing you see when you open the box is the paint job, I can understand a disappointed reaction.


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