DesertSky

I bet John is eating pop corn and watching now (joking with respect)

I see that became nebula after my responded to STU....

C'mon STU! 

Help me to become a galaxy. HA! 

Dear Proto Star,

This is not data but a flood. This is a  typical pattern of internet trolls. You have disclosed yourself and your sponsor, I think.

12 minutes ago, Stu said:

It would perhaps seem wise not to comment on things of which you have no experience in that case.

Then you should not say anything if a person says the earth is flat until you visit stratosphere... HA! 

No, Sir. I have not experienced or compared LZOS or FPL53 glass before.

I proudly own a 80mm doublet scope. An identical version is available at FLO.  

I honestly believe that I will not be able to differentiate the visual qualities of the glasses FPL51, LZOS (FPL 52 similar) and FPL53 (or FCD100) because I am only a visual hobbyist and not imaging deep sky.

On the other hand, I have a strong scientific educational background and  I work hard for the money. That helps me to judge the fair market value for a product. I would not pay a price of gold for the silver. LZOS is a marketing phenomenon. If there is someone claiming that LZOS is a TAK, TEC or AP similar product, I want to see the data. not only words.

I will be happy to answer if you have any other questions.

On 15/05/2021 at 16:16, Deadlake said:

OK-1 and OK-4 are more akin to Takahashi Fluorite lens then FPL series of glass. I think Daniel Mounsey did a shoot out of all 4" APO's in a rolling review on CN, and in the end it came down to the TSA-102 and the LZOS. Unless you have all the scopes (Daniels review stretched into 30-40+ scopes, some the same model) you can to review an objective rating is hard to make. 

This data table below shows the facts. LZOS glass is inferior than FPL53 and its producer Russians discontinue scope production long ago. A German vendor is promoting it like a first class glass by overrating it. I think it is not bad but certainly it is a second class glass. 

Common Optical Glass Types (from RefractiveIndex.info, LZOS):

Glass        Type                        Manufacturer   Abbe No. (Vd)   Refractive Index (n)   Extinct Coef (k)

H-FK61     Flour Crown            CDGM              81.59                 1.497                           9.3613E-09
D-LAK5     Lanthanum Crown   CDGM              54.9                   1.6779                        1.4009E-08
K4A          Crown                      CDGM             61.06                 1.508                          2.3438E-08
F1             Flint                         CDGM             38.01                 1.6034                        4.6783E-09
E-C3         Crown                      Hoya               58.96                 1.5182                        2.0923E-08
BSC7       Borosilicate Crown     Hoya               64.2                   1.5168                        4.6783E-09
E-F1         Flint                         Hoya               35.74                 1.6259                        1.4049E-08
FCD100   Dense Flour Crown    Hoya                95.1                   1.437                          4.6783E-09
FCD1       Dense Flour Crown    Hoya               81.61                  1.497                          4.6783E-09
FC5          Flour Crown               Hoya               70.44                  1.4875                        4.6783E-09
LAC7        Lanthanum Crown     Hoya               54.8                    1.6516                        4.6783E-09
OK-4        Special Crown           LZOS              92.04                  1.4473                        --
K8            Crown                       LZOS              64.07                  1.5164                        --
F8            Flint                           LZOS              35.57                  1.6249                        --
KF7          Crown Flint               LZOS              51.15                  1.5176                        --
FPL-51    Flourophosphate        Ohara              81.61                  1.497                         0.0000E+00
FPL-53    Flourophosphate        Ohara              94.96                  1.4387                       0.0000E+00
BSL1       Borosilicate               Ohara              63.63                  1.5101                       1.7652E-08
LAL7        Lanthanum               Ohara              58.52                  1.6516                       0.0000E+00
LAFN7     Lanthanum Flint        Schott             34.95                  1.7495                       9.3754E-09
N-KF9     Crown Flint                Schott              51.54                  1.5235                      8.2503E-09
F2           Flint                           Schott             36.37                  1.62                           3.7445E-09
K2           Crown                       Schott             60.41                  1.5111                       1.0879E-08
BK           Borosilicate Crown    Schott             63.58                  1.5197                       3.7786E-08
BK7         Crown                        Schott             64.17                  1.5168                       9.7525E-09
Soda-Lime Clear                       NA                  63.97                   1.5234                      3.8974E-07
Fused Silica - Quartz                 NA                   67.82                  1.4585                       --

I have read controversial posts about the quality of LZOS glass. Some say they are overrated because they are technically equivalent to FPL51 but not FPL53 or FCD100. Any comments about that?    

20 hours ago, Mr Spock said:

I don't know about limited range.  I can see 10-12" Newt users with a x2 Barlow seeing this as their only eyepiece. Interesting thought!

Let's see: 1200mm focal length = x78 to x156; + x2 Barlow, x156 to x312. So, x78 to x312 with just one eyepiece 

A barlow and a zoom makes 2 pieces not one  Also a good barlow can be costly like an eyepiece. Additionally attaching, removing a barlow and re-focusing is not easier than changing eyepieces. Denkmeier sells a powerswitch that can make it easy but it is not cheap.  

If you search keywords like doublet and apochtomatic, FLO will list many TS-optics, Vixen' Tele Vue, Skywatcher and Takahashi products. Pricy ones usually have FPL53 or FC-100 glass but the economical ones have FPL51 or FK61 glass that may be technically slightly inferior but they still satisfy hobbyists.

Astro Tech, Altair and Teleskop Express offer almost identical products. They offer doublets for lower price and triplets for a higher range. Triplets may have a slightly better color correction. They are all good for observing and imaging. I would watch for the First Light Optics's offerings because they have even better products.

On 03/05/2021 at 14:11, Jubi_Resik said:

Hello There

I've used so far a really cheap telescope that you can look at the moon, but its time for a big upgrade.

What I'm looking for:

Go To

Photo / Picture Capturing

Looking at Planets (no blurry images)

looking at nebulas

looking at galaxies

different eye peace's

possibly connect to pc software for screen usage

 

price range up to 1500$

 

I've no idea if I'm out of my mind with my wishes. but for me the market and numbers and features of the description for the telescopes are a bit overwhelming.

So I hope that someone can recommend a telescope for me

 

Thanks Jubi

 

 

You want too much with your limited budget.

I would recommend starting observing and learning the sky maps using a 7x50 binocular.

For general use,  an 8 inch Newtonian or a Dobsonian is great for solar system and okay for deep sky if you do not have light pollution.

Imaging is another dimension. You better experience observing first because it will cost you less than 1k but imaging can go easily up to 10k.

Clear skies, my friend. 

7.7mm-15.4mm  is a very narrow range.

I have doubts...

I would wait for some reviews to be published.