7 replies to this topic

[eyeoftexas]

The TNV-14 Eyepiece Adapter made by Televue that attaches PVS-14 night vision devices to Televue eyepieces uses the same attachment mechanism as used by the Dioptrix.  Theoretically, therefore, any non-Televue eyepiece that can have a Dioptrix attached to it should work with the TNV-14.  Is there any list of eyepieces that are compatible with the Dioptrix?  If not, do you know of any non-Televue Dioptrix compatible eyepiece?

[Notdarkenough]

Do a CN Google search. There are several threads with loads of info that are all fairly recent. For example:

 

https://www.cloudyni...optrx-question/

 

https://www.cloudyni...elevue-dioptrx/

[eyeoftexas]

Thanks. What I could find in the first thread is that the following would work:
Baader Hyperions & Morpheus
Pentax XW
APM UFF 24mm
Vixen LVW

I didn’t see any mention of any specific eyepieces. I have also found that the new APM superzoom does fit.

[JimP]

I find searching in CN is not very friendly for me. Search in Google and it will list the posts you need to read on CN.

[Starman1]

The DioptRx attaches to the top of any eyepiece with a 41-43.9mm top.

But that does not mean a night vision device is safe to use on them, because the night vision device puts substantial weight outside the eyepiece that

can apply a substantial lever arm to the attachment.

I would not advice using the NVD on eyepieces that lack a rubber eyecup "lip" on the top of the eyepiece, and that means no XWs, no Morpheus, no APM Zoom, though many ES eyepieces would work,

most TeleVues, the APM 24mm UFF, and probably others I am not thinking of currently.

 

Night vision devices have a narrow field of view, so widefield eyepieces would be a waste.

Likewise, they require fairly long eye reliefs to work well, which would rule out many eyepieces onto which they could attach.

There is a reason TeleVue markets the 55mm Plössl as an eyepiece for their NVD sales and even makes an adapter that changes the eyepiece to a 67mm focal length.

[rexowner]

This kind of belongs in the NV forum.

 

A number of eyepieces, including Pentax XW and the Baader Hyperion Zoom (I'm sure there

are many others, but I don't have an exhaustive list) have M43 threads under

the eyecup.  The BHz in particular is handy since the PVS-14 is only 40 degrees or so,

so it's useful for the entire 8-24mm range.  RAF Camera in Belarus sells an adapter to

provide M43 thread to PVS-14 thread attachment, or

you can have one made by Precise Parts, which is what I did.   IMO, the M43 provides

a much more solid attachment than the Dioptrx system.  PVS-14 is not that heavy, but

it's a lot bigger than the Dioptrx lens that that system was designed for.

Edited by rexowner, 28 February 2023 - 12:06 PM.

[faackanders2]

The DioptRx attaches to the top of any eyepiece with a 41-43.9mm top.

But that does not mean a night vision device is safe to use on them, because the night vision device puts substantial weight outside the eyepiece that

can apply a substantial lever arm to the attachment.

I would not advice using the NVD on eyepieces that lack a rubber eyecup "lip" on the top of the eyepiece, and that means no XWs, no Morpheus, no APM Zoom, though many ES eyepieces would work,

most TeleVues, the APM 24mm UFF, and probably others I am not thinking of currently.

 

Night vision devices have a narrow field of view, so widefield eyepieces would be a waste.

Likewise, they require fairly long eye reliefs to work well, which would rule out many eyepieces onto which they could attach.

There is a reason TeleVue markets the 55mm Plössl as an eyepiece for their NVD sales and even makes an adapter that changes the eyepiece to a 67mm focal length.

NV has narrow AFOV.  A TV 55mm Plössl converted to 67mm would provide a wide TFOV, but would it be wider than a 24mm Panoptic or APM UFF with NV attached?

[Starman1]

NV has narrow AFOV.  A TV 55mm Plössl converted to 67mm would provide a wide TFOV, but would it be wider than a 24mm Panoptic or APM UFF with NV attached?

A 55 Plössl converted to 67mm is a 40° field, the same as a PVS-14, but a brighter image.

One problem with higher magnifications is the smaller exit pupil and dimmer image.