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80mm ED f/10 FPL-53 & Lanthanum

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#51 Gregory Gross

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Posted 04 February 2020 - 02:58 PM

Tried the Morpheus 4.5mm and image was still bright.

So with the 4.5mm EP in the scope, your magnification would have been 178x, which is pretty high for the Moon. In my mind, the true test of control over CA occurs at high magnification. Do you recall seeing any CA at that magnification?

 

I know you said you saw zero CA, but at what magnification (and what EP) did you use? I'm assuming that was at a much lower mag.

 

All in all, I'm sure you're giving many of us that little (or not so little) tug of temptation with this scope!



#52 johninderby-uk

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Posted 04 February 2020 - 03:10 PM

Couldn’t see any CA at all with the 4.5mm. I like to use a Baader Neodynium filter on the moon as I find it increases contrast a tiny bit. The sharpness and contrast were exceptional. Was expecting it to be good but not that good.

 

It has been tested by ES Reid though and tuned up if needed and he makes sure a refractor is performing as it should. Takes any variability in Chinese optics out of the equation, 

 

Used to have an Orion ED80 years ago and I never remember it being as good as this. Of course this is early days but will see how well it goes with more observing time under different conditions.


Edited by johninderby-uk, 04 February 2020 - 03:22 PM.

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#53 Astrojensen

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Posted 04 February 2020 - 03:43 PM

More photos.

Extremely good looking setup, John. 

 

 

Clear skies!
Thomas, Denmark



#54 Tyson M

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Posted 04 February 2020 - 06:01 PM

Loving the pictures. One of my fav Long Perng scopes to date. Interested in hearing more about the scope under the stars.

#55 m9x18

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Posted 05 February 2020 - 12:27 AM

Thanks.

 

Popped it outside on the photo mount earlier this evening and looked at the moon and absolute razor sharp image with zero CA. And that was with no cooldown time. Tried the Morpheus 4.5mm and image was still bright. No vibrations on the photo mount as well.

 

Unfortunately the clouds rolled in but at least had a bit of a first light and just so impressed. One of those scopes that makes you go WOW when you look through it.

It made me go WOW just looking at it!  I can only imagine how much more I would go wow looking through it!


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#56 RadioAstronomer

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Posted 05 February 2020 - 12:44 AM

Everyone talks about color correction, as if it's the only thing in a refractor, but there are other reasons to go with a long focal length, other than achieving a bit better color correction:

 

- spherical aberration gets much easier to control

- spherochromatism becomes MUCH easier to control

- curves get gentler, making manufacturing easier, making it much more likely that the lens is of high quality

- collimation becomes much less critical

- an objective with gentler curves suffer less from aberrations during cooldown, because a difference in temperature between the front and rear lens(es) introduces less spherical aberration and spherochromatism in an objective with gently curved lenses, than one with strong curves. 

 

 

Clear skies!
Thomas, Denmark

This


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#57 johninderby-uk

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Posted 05 February 2020 - 12:02 PM

If anyone is interested in the triplets in the series the IKI observatory here in the UK will be carrying out some serious imaging using the 104 triplet fairly soon.

 

 

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#58 25585

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Posted 05 February 2020 - 05:41 PM

There are some double ED scopes out there, Takahashi TOAs employ a double ED design chasing the magic of Fluorite. Here in the USA Orion Telescopes has been marketing a few of these double ED triplets called the X2 line with weak response in the market. It seems few people are willing to pay Takahashi Fluorite doublet prices for an ED triplet scope double ED or not. TS Optics offered these scopes briefly but they are off the site now. 

TS are still offering double ED https://www.teleskop...-Elementen.html



#59 johninderby-uk

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Posted 08 February 2020 - 02:48 PM

Added a few things to the 80mm f10.

 

Fitted a Primaluce finder shoe with a curved base and it fits much better than the standard type shoe which is flat with little “legs”. Did have to drill a little dimple in the back to clear an adjusting screw in the focuser but a simple little job.

 

A Lunt 2” eyepiece to T2 adapter arrived to be fitted to the Baader prism. This will allow me to use the twist lock 1,25” eyepiece adapter that came with the scope. Needed a Baader 7.5mm  T2 extension ring as the flange on the back of the 2” nosepiece stopped the Lunt adapter from screwing all the way down.

 

Decided to use the 9x50 finder and used an old WO 7x50 one. The rings are only a few mm bigger than the finder so a close fit but still give an adequate range of adjustment. 

 

Fitted a red dot finder to the handle using a quick release bracket. Can be fitted or taken off in a second or two. 

 

      John

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#60 Gregory Gross

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Posted 08 February 2020 - 09:44 PM

John, what are your thoughts about the supplied focuser feels? How smoothly does it function? Any backlash? Does it have issues holding a heavy load in place?



#61 johninderby-uk

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Posted 08 February 2020 - 11:40 PM

The focuser seems to be really good.  Movement is smooth and not noticed any backlash at all. Last night was observing the moon which was almost overhead and with a heavy eyepiece zero slippage and movement was effortless. 

 

The focuser is called a hybrid design but is essentially an R&P. but with extra bearings. Found specs for the focuser being sold under the Primaluce brand and it claims a max load of 8kg or 17.64lbs. 

 

https://www.highpoin...ctors-pll-fhdr2

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Edited by johninderby-uk, 08 February 2020 - 11:49 PM.

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#62 m9x18

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Posted 09 February 2020 - 12:30 AM

This just gets better and better. Such a beauty!


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#63 Tyson M

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Posted 09 February 2020 - 12:35 AM

That focuser looks like a beauty!! 



#64 25585

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Posted 09 February 2020 - 07:57 AM

Looks similar to a Baader Steeltrack focuser.



#65 LunarObserver

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Posted 09 February 2020 - 12:20 PM

Is there any chance that this telescope will be available for purchase in the USA?  

Thanks,

David



#66 johninderby-uk

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Posted 09 February 2020 - 12:43 PM

Don’t know of anywhere yet in the US but this Canadian dealer shows it in stock although they don’t test the scopes as far as I know and don’t include the carry handle.

 

https://www.ontariot...ope_p_2012.html

 

I think Firstlightoptics ships to the US so might be worth asking for details.

 

https://www.firstlig...-telescope.html



#67 Tyson M

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Posted 09 February 2020 - 12:56 PM

Is there any chance that this telescope will be available for purchase in the USA?  

Thanks,

David

Ontario Telescopes is a great vendor.

 

Regards



#68 LunarObserver

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Posted 09 February 2020 - 01:28 PM

Thanks much

David



#69 25585

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Posted 09 February 2020 - 05:33 PM

FLO by default include a Vixen bar, but there is a Losmandy D equivalent  https://www.firstlig...vetail-bar.html



#70 johninderby-uk

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Posted 11 February 2020 - 09:21 AM

Interesting little bit of info about the quality of these StellaMira scopes. Apparently on the test bench they are more consistent in quality than the Skywatcher Esprit line,


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#71 Gregory Gross

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Posted 11 February 2020 - 11:45 AM

John, you’ve done us all a tremendous service by posting a multitude of photos of your new scope. Can I impose upon you for one more? I’m curious to know what the scope looks like inside of its included case. Would you snap and post a photo of the opened case with the scope sitting inside?



#72 johninderby-uk

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Posted 11 February 2020 - 01:00 PM

No problem

 

With the handle fitted the scope needs to be tilted over to allow the lid to,close. Guess the case was sized by Long Perng without the handle as the handle doesn’t normally come with the scope. It’s an option added by FLO.

 

Actually I’m thinking of buying a slightly bigger case. Found one the same length but a couple of inches wider and deeper so I would be able to store the diag and finder etc in the case with the scope.

 

        John

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#73 Gregory Gross

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Posted 11 February 2020 - 02:16 PM

But on the up side, it seems the scope fits in the case fine even with the added handle. That smaller case would lend itself well to situations where storage space is tight.

 

Thanks for posting that photo!



#74 25585

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Posted 11 February 2020 - 02:45 PM

If only FLO could do a package deal, the 80mm F10 + AZ100 mount together...



#75 johninderby-uk

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Posted 11 February 2020 - 08:43 PM

Moon taken with smartphone. Just the low res image and not the full 11mb as taken but not too bad anyway.

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Edited by johninderby-uk, 12 February 2020 - 08:48 AM.

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