Astronomy Site: Meade Advanced Products Users Group Archive: [M]: Re: 416 RESOLUTION QUESTION


 

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Subject: [M]: Re: 416 RESOLUTION QUESTION
From: Grant C. Blair
Reply To: mapug@shore.net
Date: Fri Dec 04 07:31:09 1998

While you're here, how about checking out the Astronomy Book List ?

>
> Is the 416XT able to take an image at a (variable) higher resolution ?
>
> I took some images of M57 to a MOTO PHOTO lab in town to have them
printed
> on good quality photo paper to put in my album and make a blow up to an
8X10
> for my wall. The technician said my images were about 72 dpi and thus
were
> not of sufficient quality to blow up or print. He asked me if I could
> adjust the camera to get a higher dpi factor and suggested a setting
between
> 300- 500 dpi or even more.
>
> Can this be done ? How and where do I change the setting ?

With 9 micron pixels, the KAF-0400 can record information at an incredibly
high dot density: it fits 768 pixels (linearly) into around 7mm. So one
inch could accomodate nearly four times this, yielding a "resolution" of
about 2800 dots per inch.

Since the 0400 is limited to 768 x 512, the 512 is really the limiting
number. If you fill the CCD frame with M57, you'll be looking at a
resolution of around 500 pixels/quarter inch.

It's unclear how you transferred the images from the CCD to the photo lab.
Maybe you're losing resolution somewhere in the transfer process.

Of course, if your mind is set on 8"x10" format, then you really are going
to limited to about 64 "dots/inch" unless you use some sort of mosaicing. A
regular 4"x6" should compare tolerably at 128 dpi sans mosaicing.

Grant Blair
Moorestown, NJ


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