Hi Don,
I have a HEQ5 and unsucesfully tried taking unguided photos with this mount at 380 mm FL, so will share with you my thoughts, if you do not mind... :-)
Am I right assuming you already have the mount, telescope and a DSLR?
Then I suggest you to get an OAG and a guide camera first and have fun taking photos with your DSLR before you invest in a cooled CCD.
Unguided astro imaging is IMHO just too limiting.
Good luck with astro-photography, I am sure you will have great fun and a lot of learning with whatever gear you choose.
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