Question 1

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

Accepted Answer

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.

Question 2

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.

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

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

Accepted Answer

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

ASIN	B088D37YMZ
Additional Features	45mm back focus distance, Nylon-tipped thumbscrews, Quality craftsmanship, ultra wide band fully multilayer coated lens
Best Sellers Rank	#2 in Telescope Finder Scopes
Brand	SVBONY
Built-In Media	1x SV165 mini guide scope
Coating	Fully Multi-Coated
Compatible Devices	Camera
Customer Reviews	4.6 4.6 out of 5 stars (578)
Eye Piece Lens Description	Kellner
Field Of View	2.86 Degrees
Finderscope	Reflex
Focal Length Description	120 millimeters
Focus Type	Manual Focus
Item Dimensions D x W x H	6.69"D x 5.51"W x 2.76"H
Item Weight	342 Grams
Manufacturer	SVBONY
Manufacturer Part Number	FCAW9125A
Model Name	FW9125A
Model Number	FCAW9125A
Mount	Fixed Mount
Objective Lens Diameter	30 Millimeters
Optical-Tube Length	120 Millimeters
Warranty Description	We provide 1 year warranty for SVBONY telescope accessories and 30 days no reason to return. Beyond the warranty period: We still offer maintain service, buyers are required to afford corresponding costs. We processed in the most hassle-free way possible.You just need to contact with us on Amazon ,we will reply you within 12 hours
Zoom Ratio	4

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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