What would be the ATO max focal length that you would use this guide scope with?

I don’t know what “ATO” is, but I like to have my guide scope about half of the focal length and half of the objective size of my main scope. This “rule” has worked pretty good for me. So, this guide scope is 120mm focal length, which means you’ll be good at least up to 250 mm,( which is the size scope I use this guide scope with), and probably a little bigger. You also have to take into consideration your pixel scale, which is another lengthy subject all together.

I need to know the specification for the objective lens to the focal plane (true backfocus). The 45mm cited is is focus travel, not backfocus.

Dear customer , Thanks for your contact. the objective lens to the focal plane is about 26mm. For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win. If my reply still doesn't answer your question well or you want to know more details about this product,could you please contact us by message on Amazon? Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. Sincerely look forward to your reply. Best wishes ! Kelly

Why is the video showing an ota on a 20 dslr tripod?!?

Dear customer , Thanks for your contact. It could be connected to the SV503 telescope as a guide mirror. In addition, SV165 could be directly connected to a UNC 1/4-20 tripod and used directly as a small telescope. For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win. If my reply still doesn't answer your question well or you want to know more details about this product,please contact us by message on Amazon. Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. Sincerely look forward to your reply. Best wishes ! Kelly

I'mlooking for recommendations for mounting to my ota w 90mm outer diameter...any ideas?

Dear customer , Thanks for your contact. You can search for B072BWKC5T at the Amazon front desk. For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win. If my reply still doesn't answer your question well or you want to know more details about this product,could you please contact us by message on Amazon? Because the customer's message can be seen in the first time on Amazon, and will solve the problem as soon as possible. Once I receive your response, I will try my best to answer your questions. Sincerely look forward to your reply. Best wishes ! Kelly

Item Package Dimensions L x W x H	8.07 x 5.98 x 2.99 inches
Package Weight	0.44 Kilograms
Item Dimensions LxWxH	2.6 x 2.24 x 1.1 inches
Item Weight	342 Grams
Brand Name	SVBONY
Warranty Description	SVBONY Warranty Policy: For accessories;we provide 2 months warranty;within 2 months;you can return for refund or replacement.If you have any other questions about warranty;please contact us freely;we will work with you win to win
Manufacturer	SVBONY
Part Number	FCAW9125A
Size	30mm

SVBONY SV165 Mini Guide Scope 30mm F4 Finder and Guide Scope for SV305C Pro, Compatible with Astronomy Telescope and ZWO QHY Orion Auto Guiding Cameras for Deep Sky Astrophotography

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