Greetings guys. Looking for and advice.
I currently have and Orion Sirius EQ G Mount ( 30 pound capacity).
I am interested in a big refractor just for visual. AT 125 looks like an interesting option.
Do you think that mount can handle this frac?.
6 inch F8 Dob
80 mm ED refractor
Generally speaking, I usually try and make sure that any mount I am using has at least twice the weight capacity of the refractor that I am using for visual. More if if it's for imaging.
The biggest issue with refrcators is not so much the mass of the OTA but its length, which then gives rise to potential issues due to the inertia of the moment arm.
So, balancing is absolutely critical. Make sure the OTA is loaded with all the items you will be using for visual.
Pay special attention to the DEC balancing, in both axis IE rotate the OTA in DEC 180 degrees. Take your time, close isn't good enough. The balance must be perfect.
The only divergence from this is in RA whereby some people (like me) make their mounts slightly east side heavy to help nullify backlash.
Another consideration (for visual) when using a refractor is eyepiece to ground clearance. Unless you want to be laying flat on the floor observing objects above 45 degrees. you may need to think about extending the tripod legs and / or a pier extension. I do both.
The AT125 is a fine refractor. I have one and could not be happier with it. Build quality is exceptional, irrespective of price.
Just bear in mind that you will probably be bitten by the refractor bug and in time want a larger aperture. It happens to the best of us.
With that point in mind - if you do consider another / new mount, get one bigger than you think you will need. This will future proof you for when you get a bigger aperture, and if you may want to do imaging.
Remember - you can't really over mount a refractor but you can defs under mount one.
Edited by AstroCub, 13 February 2024 - 08:54 AM.