Using the Ocal collimator made collimation much less hassle on my 200pds & I was able to get a better result than with my laser / cheshire / cap / concenter + hand held camera. It also had the added bonus that I could check the collimation both with and without the coma corrector fitted.
One star deducted as I found the instructions hard to follow...
Superb service from FLO as usual!

I used OCAl pro for GSO RC 14 inch telescope. It is very efficient to project live display of primary/secondary and center point. software is good too.
It helped to achieve 99% correct alignment, but to simulate actual optical train a Howie Glatter laser is required too.

Regards
Vikrant

I've used an advanced laser system (Howie Glatter's) for years to align my 18" Dobsonian. But I'm aware that this can not expose some errors.
The Oral collimator Pro came well packaged and relatively easy to set up. It comes with a USB OTG adapter to plug into a android tablet, but its USB C. My tablet and most others is Micro USB, but fortunately I had a micro USB version already.
I immediately could see my secondary was poorly placed and was able to get all components aligned using the Ocal. Adjusting the circle diameters on the tablet display isn't easy as the sliders are short and the adjustment needs to be fine. Just about doable though.
I have a SIPS (integrated coma corrector) installed in my focuser, which I had to remove to get a clear image. The manual says removing is optional but its not!
Once I had aligned with the Ocal I had everything pretty much perfect, only limited by the scale of the Ocal image, which even on maximum zoom cant show very fine detail. Putting my laser back in, I could see I was very close and just a small adjustment to the secondary got it perfect.
Overall, this is a very handy tool for setting up and checking collimation. I think you will still need a good laser if you have a relatively fast optical system that needs perfect collimation.

I am quite impressed with my first purchase from FLO. I live in USA and saw they had the OCAL Collimator Pro in stock, made a quick inquiry about delivery which I received a fast response and then placed the order. I was expecting a week or two for delivery but was blow away by how fast my item arrived. Got shipment notification on a Monday and package received on Thursday, same week. I don't think I have ever received an international shipment in 4 days! Definitely will come back to FLO first for future needs.

It looks as if the OCAL Collimator Pro would be the Answer to my prayers after trying many other types,
Alas both my Windows Computers will not let me download the website details to bring the camera up. They say ,it is an UNSAFE Programme.
So what to do , how do other people manage it? Frustrated , but Hopefull , Brian

The user instructions are not that clear especially regarding the Pro version on the mobile and the fact you have to copy in the Calibrator centering code from the downloaded spread into the mobile app as part of the offset. Otherwise it's an excellent tool for collimating all types of reflecting telescopes. I use it on my 8" RC and 180 Mak.

I have a Celestron C11 which I have had for quite a few years and have never felt the need to collimate it. However on seeing this product I decided to purchase it just to check that the scope was indeed fully collimated. It was easy to set up and use. Surprisingly the collimation was very slightly out. Something you would not pick up visually. I just had to tweak one of the screws on the secondary holder, and that did the trick. This product certainly did its job and was worth the investment.