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Biconvex lenses with high focal ratio, for sale

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106 replies to this topic

#101 window washer's dream

window washer's dream

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Posted 26 July 2023 - 07:56 PM

Tavi, I sent you an email to accept your offer.



#102 Tavi F.

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Posted 02 August 2023 - 02:48 PM

Tavi, I sent you an email to accept your offer.

Hello,

Sorry, only now I saw your message on the e-mail and just replied to that. Somehow it went in the wrong folder. Thanks.



#103 Tavi F.

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Posted 22 August 2023 - 10:46 AM

Update: I recently sold two packages and I still have two more.

Effective price for the lenses D36/1800mm+D63/5500mm = 50 euro

(these are the only types available)

Thanks.

Attached Thumbnails

  • Simpletele-serie 3-mod-red.jpg


#104 InFINNity

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Posted 23 November 2023 - 03:17 AM

Dear Tavi,

 

I heard from Ovidiu on the ATS-forum about your 5500mm focal length lenses and would like to acquire one set if still available. Currently I have one 1490mm focal length singlet telescope in daily use and would love to experiment with this even longer focal length.

 

Nicolàs



#105 Tavi F.

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Posted 23 November 2023 - 02:14 PM

Hello Nicolas,

 

I just sent you a pm. Thanks.



#106 InFINNity

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Posted 05 December 2023 - 03:45 PM

Dear Tavi,

lenses well received, thank you very much!


best wishes,

Nicolàs



#107 Tavi F.

Tavi F.

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Posted 21 March 2024 - 04:24 PM

Hello again,

The last set of singlet lenses is going to Germany. Thanks so much.

The topic can be closed and archived by a moderator. I would like to be able to acces it again, or make a reference to it with a link (if I will need to).

 

Personally, I still have some never ending problems with moving on my own (from dividing the inheritance) and also to make again and improve my optical workshop. But I still hope that someday I will be able to solve these problems and focus again on my passion for optical work...
Having some appropriate BK7 plates, it might be a chance to make more singlet objective lenses in the uncertain future. I mean some giant ones (D100mm)... for the most enthusiastic amateurs. 

 

53602842290_b088f4112f_b.jpg

 

For me, the upper limit in the f.l range is what I have already done (at about 5.5m), but I can say that this kind of refractor, with the objective so far ahead, it gives you a special feeling that not many people from today's world can understand.

 

Good luck!


Edited by Tavi F., 21 March 2024 - 04:25 PM.

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