richardsjacob27 wrote in post #18680728
I'm really sorry to necropost, but I just got the 150-600mm Tamron for my D750 and I love it. I've always wanted to try something bigger on my Ioptron and I was curious what mount and setup you used to make your Tamron work for you? I've been able to use my 200mm on the Skytracker, but never thought of attempting the 600mm beast.
Please don't apologize for 'necroposting'. I appreciate any comments or questions, no matter how long ago I posted the images.
I'm not sure which mount I used for the images of Orion's nebula, but probably used my Orion Sky View Pro mount. But, I often use my iOptron Sky Tracker, even with the Tamron 150-600 lens on my camera. It's just so simple to set up and use. Much quicker and easier than the Orion. I'm always careful about positioning the big lens on the iOptron, though. I try to get the weight slightly off-center to the west, to avoid straining anything in the iOptron. The main problem with using it is focusing... the ball-head is the weak link to rigidity, and it allows the slightest touch on the lens while focusing to wiggle the image all over the place in live-view. However, once I've gotten the best focus I can, the iOptron seems to be able to keep the image steady for the few seconds required to take a picture, and keep the object in place for multiple exposures. I don't remember taking any really long exposures with it, though... usually just use it for shots of the moon and planets. But, I wouldn't expect to have any problems with 10 or 20 second exposures.
One other thing about my setup... I have the iOptron mounted on a heavy-duty video tripod... no center column to bend and sway when the weight shifts due to the tracking movement. I don't think a standard camera tripod, with center column, will be rigid enough to hold things steady for long exposures with the big lens on it. However, I think it would manage to keep brighter objects, like the moon and planets in the frame while you take multiple shots. That's mostly why I use it - just to avoid having to keep repositioning the camera/lens to follow the object.
Give it a try. You don't have anything to lose, except a little time. Just try to position the camera/lens so it puts the least load on the iOptron's motor/gear train.