Is the canon 28-135 with is a good lens - Canon Digital Rebel XTi 10.1MP Digital SLR Camera Digital Camera with EF-S 18-55mm f/3.5-5.6 Lens + B

I get the same issue with that lens but on my new Canon 60D

Err 99 could mean several different things, such as... Memory Card
Lens
Lens contacts....

A few things you can try.
Remove the memory card an enable "shooting with out memory card" and see if you still get the error. If it works your memory card may be bad.
Try another lens if you can
Clean the lens contacts with a pencil eraser (be careful not to get eraser dust in the camera body or in the lens)
I have heard Canon recommend upgrading the camera's firmware (go to Canon's website todownloadthe latest firmware and follow Canon's instructions for the upgrade).
I saved the worst for last, Err 99 could be related to the shutter failing which would mean a trip to Canon for repair.
Good Luck

Quantaray makes their lenses available for a variety of camera brands. If the lens has a Canon mount, then no. If the lens has a Nikon mount, then yes.

Also, bear in mind that if the lens does not have an internal focusing motor then you will not get autofocusing with the D3000. Everything else will still work, but you'll just have to focus manually.

Yes the Canon EOS lenses from film bodies will fit and work well on Canon digital bodies.
Depending on the Canon digital body you select the lens may have a 1.6 x factor. Meaning the focal length of the film lens will become a longer focal length. For an example Canon's 50mm f1.8 lens on the APS size digital sensor will translate to an 80mm equivalent. This is great for most people but, getting a good wide angle lens is a bit of a challenge, there has to be a tread off somewhere. There are Canon full frame cameras that this factor doesn't apply, for example a Canon 5D.

I offer you to buy Canon EF 24-105mm f/4 L IS USM Lens. This gives very good performance for your studio work and specially for portre. It has Image Stabilization and Ultrasonic Motor. Other professional lens are very expensive. It has red ring.
Please check the link below.
http://www.the-digital-picture.com/Reviews/Canon-EF-24-105mm-f-4-L-IS-USM-Lens-Review.aspx

Regards

There are 2 Canon fittings, EF for all EOS cameras and EF-S for 'crop' cameras. The Canon extender does not fit crop cameras. Whichever make you look at, make sure it will fit the type of mount you have.
If you have not yet bought your lens of choice, Sigma are good and do their own extender compatible with their own lenses but not Canon's. This may be a good option for you

If it doesn't work then sorry that is how it is. I heard is not really a good reason, I hear a lot of things most is not true.

i have one.
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Manually rotating sensor rotor inside camera and cleaning gear fixed the Canon "lens error" for me.  
I placed instructions with photo's here: http://www.avh.dds.nl/Fix-Canon-SD600-Lens-Error/