Re: [APML] A long time lurker - Finally sharing some of my astrophotos...

[Michael Greger <mgreger@dashmail.net>]

I would like to know too!  It is a prime focus shot, no telecompressors,
flattners, or filters.  I can't see the blue ghosts on the film on my
light box.  In fact, there are stars behind some of the ghosts that I
can see on film, but not on the scanned image.  In addition, the stars
are somewhat bloated in the scanned images.  The film is a bit sharper.

I have to lean towards the scanner itself.  BTW, I just noticed that I
lied about which scanner it was...  I will have to fix this - sorry for
the misinformation.  I used a Nikon 4000ED to scan the images from
OSP2001.  This includes the the NGC891 and M27 shots which show the
ghosts.  The ghosts also show up on the M15 shot (different film, same
scanner).

This is the first and only time I have used this scanner.  Normally, I
do use the Polaroid SS4000, but I wanted to try the new Nikon gear.  I
was not impressed overall.  I had a great deal of trouble with daytime
shots as well.  Perhaps the scanner was malfunctioning, perhaps it was
my inexperience with the scanner, maybe it is simply not as good as the
SS4000...  But, I will probably not use it again.  I will have to try to
rescan some of these next time I rent the Polaroid.

Mike

Chris1011@aol.com wrote:

> In a message dated 10/8/2001 10:11:39 PM Pacific Daylight Time,
> mgreger@dashmail.net writes:
>
>
>
>> I am most
>> proud of some of my more recent images taken at the 2001 Oregon Star
>>
>> Party:
>>
>> ttp://rc1s3p9.dashmail.net/~mgreger/astro/gallery/Deepsky/Messier/M27/M27-2350mm/index.html
>
> I would be interested to know what is the cause of the faint blue
> ghost images of the stars on the periphery of the image. You have
> listed that it is a prime focus shot. I would have thought that it
> might be due to some telecompressor optic or field flattener glass
> just before the film plane.
>
> Roland Christen

--
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Michael J Greger                   Intel Corporation
mgreger@dashmail.net               Intel Server Chipset Design Engineer
http://www.geocities.com/mjgreger0 These are my opinions, not those of Intel!
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