Crazy File Sizes - Help!

Hello,
I have a multi-part question about multi-page PDFs. Two things are happening to me quite a lot with Acrobat and PDF creation, and I need some help figuring out what's going on.
Thing 1:
I will receive a bunch of scanned music, each page scanned separately as a separate PDF ... and each one sent in its own separate email, resulting in 30-40 emails at a time ... from another user. Each PDF page that gets sent to me tends to be somewhere around 500K. My task is to use Acrobat to combine the incoming scans into a multi-page PDF. The actual creation of the multi-part PDF is no problem. Getting Started > Combine Files into PDF is a straightforward move, and that's what I do. But the resulting multi-page PDF is HUGE. I've tried optimizing, I've tried saving it as a Small PDF ... neither of those things do much at all. I'm seeing file sizes around 5,000K by the time I'm done with an average-sized multi-page instrumental part (about 5-6 pages of music).
A big file size isn't necessarily a big deal, but I have to distribute these multi-pagers via email (that is the only electronic format that doesn't feel like alien technology to the people on the distribution list) and sending these big files in emails tends to be problematic. Slow downloads, file size limits exceeded, etc. ... this big file size thing is really annoying.
I suspect the massive file size is caused by how the initial user scanned in the pages of music, but I can't control what the initial user does; I just have to work with what arrives. Is there any way that I can fix this?
Thing 2:
I noticed that when I used the basic set-up at Fedex/Kinkos and, using a scanner and Acrobat, scanned 8.5 x 11 copies of some music as a black and white document, combining my scans into one PDF as I went and optimizing them, a file that would have been around 6,000 K coming from the other initial user and being paged together by me ended up being 568 K using this method.
When I used my camera as a impromptu scanner and used the CamScan application to take a picture of a document and save it as a PDF, I was getting pretty ridiculous file sizes, 400-500 K a page. Sam issue as with the PDFs coming from the initial user.
What is going on? Is there something in the scanning method that affects how big the file is? Is a flatbed scanner and Acrobat the only way to get small PDF sizes?
Thanks for any help you can provide...

yes it dus thanx so much.. man i dont no y i didnt see that in the first place :p i must be blind

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quote: "I am new to the Mac, and after a small learning curve am now loving it."
It only gets better
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quote: "My problem is the huge file size generated after using PS. For example my master file may be around 3mb (jpeg) but my PS file is 45mb! Now if I have a few versions of the PS file"
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quote: "above can I save back from PS in JPEG and not PSD to bring the file size down"
You might think about keeping the jpegs jpeg on the export from Aperture to PS instead of jpeg to psd to jpeg.
4. quote: "I find it hard sometimes to tell if I am on a master file or a version. Is there a way to definitely tell ?"
the "m" key toggles from Master to Version (adjusted).
5. quote: "The vault seems very slow to update when minor changes have been made."
this is contingent on the system like rpms, processor, usb or fw...
victor

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