Re: Televue 85

I would recommend star testing the scope rather than doing the test that you
are attempting.


<rmorea@xxxxxxxxxxx> wrote in message
news:1127616000.061756.222350@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi!
>
> I just bought a new Televue 85 as a small portable telescope to
> complement a big dobsonian. Just for the heck of it, I attempted the
> dollar bill test as explained by the Better View Desired webpage.
>
> Basically the test works like this. Tape a $1 bill to a fence (or
> whatever) with the back side facing outward. Set your scope up to view
> it. Notice with your naked eye that the shading under the word ONE on
> the back of the dollar bill is actually a series of closely spaced
> lines. For me, I can distinguish individual lines from about 18 inches
> or so.
>
> At 50x, which is a 12mm Radian, I can distinguish these lines from
> about 45 feet. Now, this would seem quite fine to me, and I am
> basically satisfied. But it is less than what was reported for the
> Better Views Desired reference scope, a Nikon 78mm Fieldscope, which
> resolved the lines from about 75 feet at 56x.
>
> Reasons could be anything from the reviewer has better eyes, he is a
> better observer, he used a newer dollar bill, his standard for *seeing*
> the lines is different from mine, the difference between 50x and 56x,
> or his scope is better than mine.
>
> Strangely, it doesn't bother me so much if I have worse eyes but a
> worse scope would be terrible! OK, so thats not logical. Has anyone
> else tried this test with a TV-85? Care to share the results?
>
> Thanks,
>
> Craig
>


.

Relevant Pages

  • Re: Televue 85
    ... > dollar bill test as explained by the Better View Desired webpage. ... Set your scope up to view ... This was also using a dollar bill test, but a different one that you ... Better View Desired reference standard for a couple of years! ...
    (sci.astro.amateur)
  • Re: Televue 85
    ... I'm sure every TV85 that leaves the assembly line is "diffraction limited" and that is good enough for general observing and photography. ... Set your scope up to view it. ... Notice with your naked eye that the shading under the word ONE on the back of the dollar bill is actually a series of closely spaced lines. ... Reasons could be anything from the reviewer has better eyes, ...
    (sci.astro.amateur)
  • Re: Televue 85
    ... Set your scope up to view it. ... Notice with your naked eye that the shading under the word ONE on the back of the dollar bill is actually a series of closely spaced lines. ... Reasons could be anything from the reviewer has better eyes, ... At 67 power, I can count them. ...
    (rec.birds)
  • Re: Televue 85
    ... > dollar bill test as explained by the Better View Desired webpage. ... Set your scope up to view ... > Reasons could be anything from the reviewer has better eyes, ... as would a higher contrast target. ...
    (rec.birds)
  • Re: Televue 85
    ... > dollar bill test as explained by the Better View Desired webpage. ... Set your scope up to view ... Jim is right--you're probably better off doing a star test. ... Maybe your telescope hasn't cooled down yet. ...
    (sci.astro.amateur)