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The importance of glass in night vision monoculars

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37 replies to this topic

#1 Gavster

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Posted 11 June 2021 - 06:26 AM

About six months ago I purchased a harder digital fom 2600 tube and a pvs-14 body kit from Europe. It was easy to install the tube into the body kit. However despite the high specs of the tube, I was a little disappointed with the views it gave. In particular stars were noticeably less pin sharp when compared with my actinblack pvs-14.

At the time I assumed that it was an attribute of the nv tube. However, subsequently I read some threads on specialist night vision forums which indicated that USA milspec lens gave materially better results than the “commercial” Optronics Engineering pvs-14 that I was using.

A couple of weeks ago, a European vendor started selling Carson milspec pvs-14 body kits (legally!). I decided to check out whether it was the quality of the glass that was giving the disappointing views. I received the Carson body kit this week and transferred my fom 2600 tube to it. The results are amazing. Stars are now pinpoint across the field of view, better than my actinblack and in indoor testing the additional sharpness and resolution of the views is very apparent. Clearly it was the commercial glass that was the issue not the tube!!

I just thought I’d post this info - particularly for non USA night vision users as it’s an additional consideration to improve the nv views.


Edited by Gavster, 11 June 2021 - 02:38 PM.

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#2 maxmir

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Posted 11 June 2021 - 08:19 AM

I have a Carson PVS-14. The lens is great.


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#3 Joko

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Posted 11 June 2021 - 01:30 PM

Clearly it was the commercial glass that was the issue not the tube!!

I'm pleased you like it.

You have one of the best tube ever made in this Carson PVS-14 ! smile.gif


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#4 john hraba

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Posted 11 June 2021 - 02:10 PM

Is the objective lens, used in the Carson PVS-14, available separately? Perhaps with C-mount threads? 


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#5 Trentend

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Posted 11 June 2021 - 02:57 PM

Is there a pvs7/bino version kit?



#6 Gavster

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Posted 11 June 2021 - 03:27 PM

Unfortunately I don’t think there is a c mount version or pvs7 version of the Carson milspec lens available but others may know better.

interestingly I’ve just done some further indoor tests of the Carson pvs-14 against my envis lens and the Carson wins in sharpness and resolution quite clearly as well. I’m very impressed.


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#7 a__l

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Posted 11 June 2021 - 10:08 PM

The question is, this version of PVS-14 is likely to have problems with c-Moutn. I are waiting for the experiment with lathe this lens for M31x0.75 threads.
Actually I made this for M31x0.75 for my Zeiss Tevidon f/1.4 But it does have vignetting as it cannot fully operate on an 18mm sensor (for afocal use with TV67).
I processed my SIPS module on a lathe without any problems (cut off the excess thread). Without removing the glass. Now it can be used as P2.


Edited by a__l, 11 June 2021 - 10:18 PM.

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#8 Joko

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Posted 12 June 2021 - 01:09 AM

Is there a pvs7/bino version kit?

Yes, OVNI-B are made from MIL-SPEC PVS-7 parts.

But not with the 1st prototypes I made like the one you own.

There are few other differences between prototypes and final version available since end of 2020.


Edited by Joko, 12 June 2021 - 01:11 AM.


#9 Tyson M

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Posted 12 June 2021 - 08:59 PM

I really like this set up of your Gavin...with the Carson/harder tube. 

 

Edit: is this the omni tube not harder? I could be mistaken a bit here.



#10 Gavster

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Posted 12 June 2021 - 09:12 PM

I really like this set up of your Gavin...with the Carson/harder tube. 

 

Edit: is this the omni tube not harder? I could be mistaken a bit here.

It’s a harder fom 2600 tube. (Ovni-m is the complete nv monocular sold by ovni which contain harder tubes but have different body kits/lenses to the pvs-14).

 

For an indication of the views through this Carson harder pvs-14 here is a link to a video I took of the Milky Way earlier this evening.

 

https://youtube.com/...c?feature=share

Also attached are a couple of phone shots of the North America and Veil nebulae, also taken this evening, but with my WO Pegasus 103mm binoscope and 67mm Televue eyepiece in afocal mode.

Attached Thumbnails

  • 473A5B24-0502-433F-B85C-4A844F0641E1.jpeg
  • 820AC294-C8F3-46C7-BD14-A4F90CB94004.jpeg

Edited by Gavster, 12 June 2021 - 09:21 PM.

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#11 Tyson M

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Posted 12 June 2021 - 09:37 PM

YouTube video says it's private.



#12 GeezerGazer

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Posted 12 June 2021 - 09:40 PM

I'd like to see the video too, but going to the link, says it's a private video, so unavailable.  Can you unlock it?  

Ray



#13 Gavster

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Posted 13 June 2021 - 12:03 AM

I'd like to see the video too, but going to the link, says it's a private video, so unavailable.  Can you unlock it?  

Ray

Apologies, I think I’ve made it public now.


Edited by Gavster, 13 June 2021 - 02:36 AM.

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#14 Joko

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Posted 13 June 2021 - 03:47 AM

Edit: is this the omni tube not harder? I could be mistaken a bit here.

Hi Tyson,

It's an astronomy grade tube that i supplied to Gavin. There are other PVS-14 users who bought from me their tubes to swap with their existing IIT. Same specs than for the OVNI-M / OVNI-B but different connectors for it's PVS-14.

I can design and supply any kind of tubes manufactured by harder based on my specifications. They are not from batch of production like all other.

Only my company is able to provide those custom tubes because they are OVNI Night Vision innovation.


Edited by Joko, 13 June 2021 - 04:07 AM.

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#15 Deadlake

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Posted 13 June 2021 - 07:50 AM

Gavster, is this where you ordered the housing?

 

https://nighttec.net...ull-set-carson/


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#16 Gavster

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Posted 13 June 2021 - 08:50 AM

Gavster, is this where you ordered the housing?

 

https://nighttec.net...ull-set-carson/

Yes that’s right


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#17 a__l

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Posted 13 June 2021 - 09:22 AM

Gavster, there is any inscription on the lens that it is Carson?



#18 GeezerGazer

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Posted 13 June 2021 - 11:13 AM

Nice MW video on the link; thanks for unlocking.  Looks like a great tube.  

Ray


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#19 Gavster

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Posted 13 June 2021 - 11:34 AM

Gavster, there is any inscription on the lens that it is Carson?

Nothing I can see



#20 maxmir

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Posted 13 June 2021 - 12:27 PM

I can attest to quality on the Caron PVS-14 lens.

I just moved my tube to from a Carson PVS-14 to a Mod-3C body.

 

I also moved the eyepiece and objective lens.

I had to machine new C mount threads on my lathe.

The PVS 14 lens housing is aluminum.

 

I protected the ends  of the PVS lens with optical tissue and frogger masking tap.

I had a PVS to eyepiece lens adapter that I had made before for afocal . 

This threaded into front of the lens and is a stiff barrel to hold in the  lathe chuck.

Turned down the old thread area to 0.992-3 inches and cut 32 tpi threads for the C mount.

 

The length of metal area on Carson PVS 14 lens will make new C mount  threads that sit about flush at  infinity at 1x.

I had no problem focusing several lens afocally last night.

 

Now, what to do with Carson body.

What should I ask for it on ebay?

Just about new.

 

Max


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#21 a__l

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Posted 13 June 2021 - 07:46 PM

I have a question, why not thread М31х0.75?



#22 a__l

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Posted 13 June 2021 - 07:49 PM

Nothing I can see

Are there any inscriptions on NV's body confirming that it is Carson? Can you take a photo?
Thank.



#23 a__l

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Posted 28 June 2021 - 11:55 AM

I have a question, why not thread М31х0.75?

Well I didn't get an answer, I started sorting out on my own.
You can't make M31 there. Only M27, M26, etc.

In addition, a stop ring must be made on the lens so that the lens does not fall inside the NV.

 

Maxmir, you would post a photo. Who will make it later will be unclear.

For Mod3, you need to solve the issue with the setting to infinity. There is no adjustment on the lens. It is necessary to make an adapter with a greater thickness and cut it off little by little with a milling cutter, followed by a star check.
As a result, experimentally find the required thickness.
Let me remind you that for afocal use it is desirable that the lens be focused to infinity.

To use 1x for me is not relevant. Zeiss Tevidon works well for me. Although options are possible ...


Edited by a__l, 28 June 2021 - 12:20 PM.


#24 a__l

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Posted 28 June 2021 - 12:05 PM

Nothing I can see

It’s strange. There should be an inscription on the lens confirming the manufacturer Carson. I studied the internet. It happens that even serious suppliers sell lenses of unknown manufacturer (up to plastic housings).


Edited by a__l, 28 June 2021 - 12:06 PM.


#25 maxmir

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Posted 28 June 2021 - 08:29 PM

I don't see the name my the Lens either. I know the Kosher surplus l told me he only builds PVS-14 with Carson components.




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