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

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.

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

Is it works with a celestron se 8 telescope ?

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

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

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

Item Weight	230 Grams
Exit Pupil Diameter	3 Millimeters
Objective Lens Diameter	21 Millimeters
Item Dimensions D x W x H	4.33"D x 2.76"W x 3.15"H
Optical-Tube Length	7 Millimeters
Coating	Fully Multi-Coated
Focal Length Description	21 millimeters
Field Of View	40 Degrees
Zoom Ratio	0.12569444444444444
Power Source	Zoom Eyepiece
Finderscope	Reflex
Compatible Devices	telescope
Eye Piece Lens Description	Plossl
Mount	Fixed Mount
Focus Type	Manual Focus

SVBONYSV135 Zoom Eyepiece, 1.25inch 7-21mm for Telescope, FMC 6 Element 4 Group Lens, Accessories for Planetary Moon Astronomy Observation

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