Question 1

What is the difference between this line lf eyepieces and the 66 HD yellow band eye pieces?

Accepted Answer

The difference between the two is:
1.The field of view is not the same，One is a 68 degree field of view，The other is a 66 degree field of view
2.Secondly, the design of these two products is different.This eyepiece of 68 degrees adds a part of the rubber ring design, making it more comfortable to use.

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 2

Anyone know what type are these? Plossl, Kellner, etc?

Accepted Answer

I do not believe these are Plossl as the Plossl have a four element design and an apparent field of view of about 50 degrees. They definitely are not Kellner. I have asked the same question and believe they are Erfle.
Erfle is a five or six element eyepiece and is optimised for a wide field of view, 60 to 70 degrees. At low powers it provides impressive deep sky views. At high powers the image sharpness suffers at the edges.

Question 3

All the eyepieces in the set really have long eye relief as advertised? I'm wearing glasses.

Accepted Answer

Dear friends, 
Sincerely hope that you know that our product's eye reliefs 17 mm.When the telescope is adjusted, it can be adjusted clearly without wearing glasses. If you can't take your glasses, our product can also be used normally.At the same time, please don't worry, we will be responsible for every product we sell. If you want to learn more details about this product, please feel free to contact me by email on Amazon, I will try my best to answer your question. Sincerely looking forward to your contact.
Angela

Question 4

what is the warranty period of the eyepiece?

Accepted Answer

Dear customer , 
Thanks for your contact.

For eyepiece;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

Package Dimensions L x W x H	21.2 x 13.2 x 5.5 centimetres
Package Weight	0.5 Kilograms
Product Dimensions L x W x H	10.2 x 10.2 x 10.2 centimetres
Brand	SVBONY
Objective Lens Diameter	20 Millimetres
Part number	FUSFN6002
Size	6mm 9mm 15mm 20mm
Telescope Mount Description	Fixed Mount
Focus type	Manual Focus
Guaranteed software updates until	unknown

SVBONY Telescope Eyepiece FMC Broadband Green Film Telescope Accessory 1.25 68 Degree Ultra Wide Angle Eyepiece Set for Astronomical Telescope(6mm 9mm 15mm 20mm)

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