Question 1

Is there a way to attach it to canon dslr for astrophotography ?

Accepted Answer

For casual astrophotography, you can purchase a smartphone adapter clamp that attaches to the eyepiece and centers the smartphone camera lens on the image projected by the eyepiece.  Set your phone to snap a picture on voice command (most of them let you do this.) You can try letting the phone snap a picture automatically, or set your phone's camera to manual focus, and set the ISO and desired time exposure(s) for the image. Make sure you don't have any stray light or lay a black cloth over the assembly.  It works surprisingly well.

Question 2

Is it Parfocal

Accepted Answer

Dear customer , 
Thanks for your contact.
No,  it is not Parfocal.SV118 Telescope Eyepiece Set is Parfocal.ASIN is B07TLKBPNJ.

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

Is it works with a celestron se 8 telescope ?

Accepted Answer

Dear customer , 
Thanks for your contact.
Yes, SV135 Telescope Eyepiece can fit telescope with 1.25inch barrel.

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 4

Would this be good to use with an 8" dobsonian? i see its only 1.25in not 2

Accepted Answer

Dear customer , 
Thanks for your contact.
Yes,SV135 Telescope Eyepiece is 1.25in .

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	B07Z64NK65
Additional Features	40 degree - 57 degree wide angle field of view, 6 Element 4 Group, Fully multi-coated, Zoom 7 to 21mm
Best Sellers Rank	#2 in Telescope Eyepieces
Brand	SVBONY
Built-In Media	1X 7 to 21mm Zoom Eyepiece
Coating	Fully Multi-Coated
Compatible Devices	telescope
Customer Reviews	4.5 out of 5 stars 1,542 Reviews
Exit Pupil Diameter	3 Millimeters
Eye Piece Lens Description	6-Element 4-Group Fully Multi-Coated
Field Of View	57 Degrees
Finderscope	no
Focal Length Description	93 millimeters
Focus Type	Manual Focus
Item Dimensions D x W x H	4.33"D x 2.76"W x 3.15"H
Item Weight	230 Grams
Manufacturer	SVBONY
Manufacturer Part Number	EUW9105A
Model Name	SV135
Model Number	FAUW9105A
Mount	Fixed Mount
Objective Lens Diameter	21 Millimeters
Optical Tube Length	7 Millimeters
Optical-Tube Length	7 Millimeters
Power Source	Zoom Eyepiece
Telescope Mount Description	Fixed Mount
Unit Count	1.0 Count
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	3

SV135 Zoom Eyepiece, Zoom 7 to 21mm 1.25 inch Telescope Eyepiece, 6 Element 4 Group Telescope Accessories for Astronomic Telescopes Visual

Details

Details

Description

Specifications

Common Questions