Ollin has great customer service. They will try to give you a work around solution. They are continually releasing new lense adapters for spotting scopes.
Trijicon is hard to beat for the price. I have a Trijicon 1-10x28 Credo. It is illuminated Red/Green and the
glass to me is equal to my illuminated Leupold Mark5 3.6x18x44's and Zeiss S3 4.x25x50's. The illumination is daylight bright. I will purchase another Trijicon.
I love Leica and Leupold, but the best value/ warranty is the Vortex 4000 GB. You can get substantial discounts from MSRP. Often they are on forums NIB for excellent prices. I have one that I got NIB for $570. delivered. Vortex & Vortex dealers offer discounts around holidays.
The Zeiss LRP S3 4x25x50 is fantastic. You can find them on sale for around $1850, sometimes cheaper.
The scope is illuminated and has fantastic glass. I also like Leupold M5 3.6x18x44, you can find them for less than the MSRP.