G'day Joel,
First up welcome to IIS
There are answers here to any astro question you might have, and then some.
I guess to assist you in your quest I reckon you should ask the following:
1. Why do I need a collapsible scope? Storage, transport or just like the idea.
2. What are the maximum acceptable dimensions when collapsed?
3. What is the maximum acceptable weight in transport mode?
WRT photography, my understanding (I don't do imaging) is that limited imaging can be done with a dob on an equatorial platform but that most people end up with a heavy duty (and heavy) equatorial mount. for this purpose. A commercial collapsible dob is probably not compatible with an equatorial mount.
BTW, what sort of 4" refractor and mount have you got?
Cheers,