14376Re: Dark Line, Spikey Star Problems
- Apr 1, 2007--- In William-Optics@yahoogroups.com, "Timm Bottoni" <t.bottoni@...>
> I think it's a much more common thing than people realized. And since
> it doesn't effect visual use, and many people don't find it all that
> objectionable, and it seems like it is easy to negate with a slight
> aperture mask, I pretty much consider it to be almost a non-issue for
> most people. I wonder how many scopes besides the ones that have been
> mentioned here also show this effect or similar effects?
> I was looking at a book in Costco on Astronomy and notices all sorts of
> pictures, professionally shot, published in a book, that had all sorts
> of spikes and dark lanes in various shots.
> I just spotted a picture posted on a CN post taken with a SV NHNG that
> also shows the same thing, and I recall that many scopes show these
> effects, so it's clearly a common design comprimise that many
> manufacturers and customers have lived with for years.
> 9/page/1/view/collapsed/sb/5/o/all/fpart/all/vc/1>Hi Timm,
> On my original 80SD lens, I could see the spacers, but on my 80FD lens I
> can't so it seems likely that the various manufacturers have gone with
> maximum aperture.
> I honstly don't think it's a big deal - I would love a FLT132 some day
> when I can afford one, and a mount to go with it, and the time to use
> it, and some clear and dark skies - oh well, you get the idea.
This is obvious on the picture.
So, we know for now that it happened on TMB, Tak and SV too.
I bet it also happened on XX expensive refractors but the difference
is that they do not say anything about it ; it must be harder to
It must be a matter of design and as you said not really objectionable.
May be this will be the end of what was sometimes looking, IMO, as WO
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