There are always use a negative achromatic doublet lenses for the making of 1x, 2x, 3x or 5x barlow eyepiece, when you use the short distance from the subjective lens so get it less zoom range and use a long distance from the subjective lens ! You get long zoom range like 2x, 3x, 4x, or 5x I hope understand this concept.
@@rudragraphicworldand how do you exactly define what is a long distance and short distance from subjective lens? How much mm long distance and how much short? How many mm is 2x and how many mm 3x? Please explain this in detail
@@aakibart you would have to used biconcave lens and lens focal length minimum 50mm. Always remember that, magnifiyings depended trough focal length on subjective lenses.
very nice
Thank you for making this video. I was thinking of buying this lens from Amazon to make a Barlow lens, now you have cleared my doubts.
Very good work bro.
Bahut badhiya
How you know it is 3x Barlow? Can you explain please. It can be 2x or 1.5 x so how u know that it is 3x
There are always use a negative achromatic doublet lenses for the making of 1x, 2x, 3x or 5x barlow eyepiece, when you use the short distance from the subjective lens so get it less zoom range and use a long distance from the subjective lens ! You get long zoom range like 2x, 3x, 4x, or 5x I hope understand this concept.
@@rudragraphicworldand how do you exactly define what is a long distance and short distance from subjective lens? How much mm long distance and how much short? How many mm is 2x and how many mm 3x? Please explain this in detail
Where is link
Anand traders barlow lens for DIY telescope barlow,22mm dia negative achromat doublet lens. amzn.eu/d/6SAbLHx
chamfer for easy start, flat black not shiny, sand paper.
dont wrap the lens magic marker to color them.
How many lens use in Barlow
Only one lens used in barlow
@@rudragraphicworld focal length?
@@aakibart focal length not specified only nigative focal type lens used in barlow
@@rudragraphicworld i know but , what is focal of concave
@@aakibart you would have to used biconcave lens and lens focal length minimum 50mm. Always remember that, magnifiyings depended trough focal length on subjective lenses.
Yes parches Barlow lens price
This Barlow lens I make within 600 rupees near about.
How to purchase this lens
You can buy through amazon.in or also purchase from me.
Yes
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