Object still photography, ideas for necktie true color and crisp closeup shots?

Am high volume necktie seller on eBay. I take good pictures but I want best. I have Nikon D-50 and professional light box. I have problem getting true color specially yellow gray and sky blue. Some body suggest me setting on camera and good lens for this purpose. Money is not matter to buy any equipment.

To take good product photos, you don't need a special camera, you just need to pay attention to your details.

Here is how to do it the cheap way:
- Build yourself a light tent, it can be as basic as a card board box http://www.digital-photography-school.com/how-to-make-a-inexpensive-light-tent
- Use desk lamps with bright full spectrum (a.k.a.daylight) bulbs
- Use white background paper and change it often to keep it spotless
- put your camera on a tripod
- set up custom white balance (read your manual on how to do that) for perfect colour
- if your product is really tiny, be sure to use the (super) macro setting on your camera. If you have a DSLR, you may want to use extension tubes together with the macro lens.
- overexpose the photos slightly to keep the whites white, instead of grey (because due to all the bright light, your camera will want to under-expose the shot). Either go fully manual, or use exposure compensation (read the manual if you don't know how to do this).
- In Photoshop (or other editing program), put on the finishing touches - but you shouldn't need too much since you are starting out with a very good photo.

What you need is a device like the Xrite Colorchecker Passport.

With it you can accurately match the colours of your ties with the photos. Textiles are the most difficult to match colours.

It is also important that your monitor has been calibrated and profiled routinely

Using the Colorchecker Passport

http://www.xritephoto.com/ph_learning.aspx?action=webinarsarchive&eventid=1105&eventdateid=4929

Using a monitor calibration tool

http://www.xritephoto.com/ph_learning.aspx?action=webinarsarchive&eventid=1073&eventdateid=4885

http://www.xritephoto.com/ph_learning.aspx?action=webinarsarchive&eventid=1073&eventdateid=4885

To use the colorcheckere, you will need to shoot in RAW and use Adobe Lightroom to set the custom white balance