You probably will not see them here unless you build one.
In recent discussions with Ales at iStar Optical (I am building a 127mm f12, 1500mm fl, Anastigmatic R30, TCR tube frame clone), he advised that they can't justify an Australian distributor their scopes because they would cost too much to get them to us, and be up against ED APO price points. Thus, he encourages us to build our own using his objectives, which is what I am doing, and what MattT recently did, and some others.
Must admit would be very tempted if I save my pennies by the end of the year.....in case your interested OPT sells the WFT 204 for $3196.00 US D
CHEERStOM
Read the review , its an Istar not a garden variety objective , for its purpose its awesome .
If interested here in a venus shot taken at 2000mm using my TV 2x powermate and sony A200 DSLR , zero work just sized , so you can you make a judgement on what the CA ratio ? is supposed to be in my Istar 127mm f8 achromat ( 1000mm ) on the CA ratio tables you used here , look at this photo ? please I am interested .
The proof is in the viewing , sorry to say .
Brian.
Quote:
Originally Posted by cometcatcher
At F5.9 those Istar lenses will need to be good with a CA ratio of 0.73. That's like a 6 inch F4.4. In an achro? Mmm.
Last edited by brian nordstrom; 17-04-2014 at 09:53 PM.
, people magnet on public nights ,, awesome .
Imagine M42 in this scope? a hit for sure .
While I am at it Lewis here is a way over exposed moon shot , 12mm TV Radian , windows phone camera .
Any idea what the CA 'Ratio ? ' is supposed to be here ? .
I await your true/hard/right ? review of this shot , ( I have many more ) it's
as usual a raw shot .
Brian.
Quote:
Originally Posted by LewisM
I am guessing the meaning of WFT... What a Freaking Telescope...
Last edited by brian nordstrom; 17-04-2014 at 11:01 PM.
:thumbsup :, easy cool brother ,
You are welcome any time to come along to us any time .
Refractor lovers , I see by your sig. you are a refractor user and yes these Istar objectives we are are and a 'Gift' at these prices this year ,,, they wont stay this way ,, save up and grab one build a primo refractor OF YOUR DREAMS .. .
This photo is #30, ( last one was #28 ) Lewis .
Brian.
Quote:
Originally Posted by cometcatcher
Sorry, must remember not to be skeptical in front of the Istar club.
If memory serves me correctly Istar have been making for some time previously another 8" achro which I believe is F9. Although I am not aware of any large reviews I have seen a few short 1-2 paragraph reviews on it which were all very favourable. I also believe there is a u-tube clip of it in action as well. The only immediately apparent downside being the general size of the OTA being a fraction smaller than the average Howitzer
Don't get me wrong, I'm not bagging Istar. They fill a gap between achro and APO. The 8" F5.9 I'm sure would be a deep sky and comet killer, something it was designed for. I'm just mentioning it may disappoint some for planetary viewing. Everyone has different CA tolerances and the CA of an 8" at F5.9 may be a bit too much for some.
Brian, your Istar would have considerably better CA than the 8 inch due to aperture and focal ratio. Other factors being equal, it's focal ratio divided by aperture in inches. The higher the resulting figure the better the CA.
Quite right Kevin .... the 8" inch Istar is primarily a Deep Sky ' Wide Field ' Instrument..... not a Planet Killer.
I'd love to have a look thru' one .... would most likely have me wanting one if I could .... Wide Field views are my ' thing ' and of course DSO's
My NA140 does that for me using ' low power ' eyepieces.
Quite right Kevin .... the 8" inch Istar is primarily a Deep Sky ' Wide Field ' Instrument..... not a Planet Killer.
I'd love to have a look thru' one .... would most likely have me wanting one if I could .... Wide Field views are my ' thing ' and of course DSO's
My NA140 does that for me using ' low power ' eyepieces.
..... I'm a ' fan ' .... I just haven't got one yet ...... 
Read the review , its an Istar not a garden variety objective , for its purpose its awesome .
