38 replies to this topic

[jag767]

https://www.teleskop...5--Focuser.html

I mean, FPL53 and Lanthanum, 150mm aperture, quite sufficient focuser, at an excellent pricepoint. Im trying to find a reason not to buy one. I know there's going to be some color, but it cannot be that much.

Anyone considering this?

Edited by jag767, 01 February 2020 - 05:29 AM.

[Jond105]

I would be if I had the mount already. Definitely going to beat out the Skywatcher and APM doublets sold here in the US.  Looks sweet. 

[F.Meiresonne]

Well , i have a 102 mm F/7 doublet with FPL53 and Lanthanum, from TS

It sure impresses me. Virtually without color this one is.

 

Off course 150 mm is not 102 mm but the former one works at f/8.

 

I would expect a bit of color, but if the doublet is made well, i suspect there will be not much.

 

If i would a 150 mm refractor for visual i would go for such a doublet, nothing less anymore.

 

Hmm, for its size it is not that heavy too, only 9 kg!

Edited by F.Meiresonne, 01 February 2020 - 05:54 AM.

[bobhen]

Execution has no bearing on color correction. The color error is fixed with the lens design.

 

When considering a mount for a longish refractor, weight capacity is only one part of the equation. Will the mount handle the moment arm swing of the tube also has to be considered.

 

This ED refractor looks attractive and discounting color error and mounting decisions, I would want an optical quality guarantee with any of these lower cost 150 mm ED refractors.

 

If I could get an optical guarantee “minimum” of 1/8th wave, I’d be all in. Without that, there’s not much point in a lesser quality 6” class ED refractor (no matter how low the price) for high power visual lunar/planetary observation, which is one reason to get a large refractor in the first place.

 

Bob

Edited by bobhen, 01 February 2020 - 07:28 AM.

[MalVeauX]

How did they get that thing to 8kg? Wow. I imagine it would have only minor bits of CA, but I don't even care about that as much, I'm curious about the rest of its optical properties for that price. But I imagine it's good and is a nice option if you want a 6" that's better than the SW 150 ED and its price, this is a bit more but steps up to FPL53.

 

Very best,

[Erik Bakker]

For that amount of money, EUR 2699, no 150mm APO can be made to perfection. If that is OK with you, it could be a nice scope for the money.

[jag767]

How did they get that thing to 8kg? Wow. I imagine it would have only minor bits of CA, but I don't even care about that as much, I'm curious about the rest of its optical properties for that price. But I imagine it's good and is a nice option if you want a 6" that's better than the SW 150 ED and its price, this is a bit more but steps up to FPL53.

 

Very best,

 

It's  like you read my mind. Spherical correction tends to be the big one for me. I may have to be the gonea pig....

[junomike]

How did they get that thing to 8kg? Wow. I imagine it would have only minor bits of CA, but I don't even care about that as much, I'm curious about the rest of its optical properties for that price. But I imagine it's good and is a nice option if you want a 6" that's better than the SW 150 ED and its price, this is a bit more but steps up to FPL53.

 

Very best,

9kg/19.8lbs which is still impressive
 

[MalVeauX]

9kg/19.8lbs which is still impressive
 

They have it listed twice... 8kg in the description, 9kg in the specs.... odd. Probably 9kg.

 

Very best,

[Carl N]

So roughly $2600 plus need to ship it and possible customs fees. Doublet, like the APM, with a 2.5" focuser.

Our sponsor has a 152/f8 with a triplet lens and 3.7" focuser with fk61 and lanthanum for $3999 with free shipping which occasionally goes on sale for $3500.

I went for the triplet and love it.

[jag767]

So roughly $2600 plus need to ship it and possible customs fees. Doublet, like the APM, with a 2.5" focuser.

Our sponsor has a 152/f8 with a triplet lens and 3.7" focuser with fk61 and lanthanum for $3999 with free shipping which occasionally goes on sale for $3500.

I went for the triplet and love it.

 

 

Customs will be a no, and its $2500. Often I've gotten shipping for 10 euro to the US from them. Huge difference. 

[Jon_Doh]

This must have been the refractor Markus was referring to when he said the APM had been copied.

[MalVeauX]

Just a note for folk in the States, I'm in Florida, I bought a 20lb 200mm F6 Quartz newt from TS and it shipped to me for about $60 USD, no Vat, no duties, no taxes. And it was 2 day shipping at that. TS is awesome.

 

Very best,

[Moravianus]

Definitely going to beat out the Skywatcher and APM doublets sold here in the US.  Looks sweet. 

Why you think so ? This is the same scope like the APM except some details and maybe quality control.

[Jond105]

Why you think so ? This is the same scope like the APM except some details and maybe quality control.

FPL-51 vs FPL-53

[Astrojensen]

FPL-51 vs FPL-53

Doubt it makes much of a difference in terms of color correction, really. The color correction in my APM 152 is very, very good. 

 

But a side-by-side shootout would be quite interesting. 

 

 

Clear skies!
Thomas, Denmark 

[tonyt]

Here's a 5 minute jpeg through the Evostar 150ED with IDAS D2 filter, no reducer or flattener. FPL53 would obviously straighten out the polystrehl curve more and probably remove the residual colour error around brighter stars.

 

The Skywatcher seems to be well figured and suits my wallet, but I'd certainly take FPL53 if price wasn't an issue (and figuring was as good). Our options keep imroving as time goes by to the point that we're spoilt for choice

 

 

[HydrogenAlpha]

They are selling the triplet version for just EUR 200 more:

https://www.teleskop...PA-focuser.html

 

So I don't see a reason to get the Lanthan doublet other than it being lighter, which can be quite a significant point for many. I suspect most users of this scope are visual users (being rather slow at f/8), in which case triplet levels of colour correction are probably unnecessary. 

[vkhastro1]

They are selling the triplet version for just EUR 200 more:

https://www.teleskop...PA-focuser.html

 

So I don't see a reason to get the Lanthan doublet other than it being lighter, which can be quite a significant point for many. I suspect most users of this scope are visual users (being rather slow at f/8), in which case triplet levels of colour correction are probably unnecessary. 

The triplet is actually a better deal since it is also using the larger 3.7” focuser !

[tony_spina]

The triplet is not FPL‐53

[HydrogenAlpha]

The triplet is not FPL‐53

An FPL-51 (or equivalent) triplet should outperform an FPL-53 doublet, however. 

[junomike]

An FPL-51 (or equivalent) triplet should outperform an FPL-53 doublet, however. 

"Should" being the operative word. IME the ES 127 (FCD-1 Triplet) does not out perform the 120ED (FPL-53 Doublet).

YMMW

[aa6ww]

Glad a high quality 152ED refractor will still be for sale once the APM's are gone.  

 

Lucky for those of us who got our APM 152ED's and the peek of the low prices that were offered from Outdoor Sports Optics. Got mine in October 2018.  

 

The OTA with focuser weights 19.6 pounds. Pretty light for a big refractor. My eyepiece cases weights more then the OTA.

 

looking forward to 2020!!

 

...Ralph

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Edited by aa6ww, 02 February 2020 - 01:31 PM.

[Tyson M]

Hmmm I am curious here on this offering.  Not in the sense I want to buy this new large apo, but more along the lines that the TS152 achro is so good.  I owned the latter and it was an amazing deep sky scope with very little in focus color, except on the moon.

 

See the color crossings and compare yourselves (note the x axis scale)....the apo is (marginally) better by the looks of things but I think would probably snap up the faster achro for visual over this if I was primarily deep sky observing.. 

 

Edited by Tyson M, 02 February 2020 - 01:52 PM.

[F.Meiresonne]

Doubt it makes much of a difference in terms of color correction, really. The color correction in my APM 152 is very, very good. 

 

But a side-by-side shootout would be quite interesting. 

 

 

Clear skies!
Thomas, Denmark 

Technically it should, FPL 51 has an abbe nmber  somewhere in abouth 80 , FPL53 about 95 so..definately a difference...