Nikon CFW & CFWN eyepieces->Difference?

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Soki
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Joined: Sun May 03, 2020 5:05 am

Nikon CFW & CFWN eyepieces->Difference?

Post by Soki »

Hey guys,

Does anyone know something about the difference in quality of the Nikon CFW and the newer Nikon CFWN eyepieces?
For example the Nikon CFW10x / 20 and a Nikon CFWN10x / 20 eyepiece.

Thanks and best regards,
Simon

Ichthyophthirius
Posts: 1152
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Re: Nikon CFW & CFWN eyepieces->Difference?

Post by Ichthyophthirius »

Soki wrote:
Fri Feb 05, 2021 3:42 pm
For example the Nikon CFW10x / 20 and a Nikon CFWN10x / 20 eyepiece.
Hi Simon,

There either was no "CFW10x / 20" or it was very rare. There are a number of Ebay listings of this eyepiece but they are all incorrect.

The "CFW 10x" had FN 18. It was part of the first generation of CF optics in the 1970s (e.g. for the Optiphot).

The CFWN 10x was part of the new and improved CFN optics in the 1980s. Most of them had FN 20 and that was written on the eyepiece as "CFWN 10x/20".

They are compatible, interchangable and both have high eyepoints, but the CFWN is the newer eyepiece, with a larger field of view.

Regards, Ichty

viktor j nilsson
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Re: Nikon CFW & CFWN eyepieces->Difference?

Post by viktor j nilsson »

The CFW10x has a FN of 18, the CFWN10x came later and has a FN of 20.

Optically, they are very similar. The CFWN, however, is prone to develop haze in the front lens doublet. I know some people avoid the CFWNs because of this.

Soki
Posts: 76
Joined: Sun May 03, 2020 5:05 am

Re: Nikon CFW & CFWN eyepieces->Difference?

Post by Soki »

Thank you very much for the explanations.
Now I got it.
Are there any other eyepieces which are compatible with CF-free objectives from Nikon with a FN of 20mm?

viktor j nilsson
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Location: Lund, Sweden

Re: Nikon CFW & CFWN eyepieces->Difference?

Post by viktor j nilsson »

Nikon also made eyepieces that were better corrected than the standard eyepieces, known as the CFD (FN18) and CFWND (FN20). They were really expensive and are very rare.

Apart from those, there isn't really any other original Nikon eyepieces to choose from (unless you have the UW head).

But there are also some generic Chinese 10x/22 eyepieces that perform really well with Nikon CF objectives.

Scarodactyl
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Re: Nikon CFW & CFWN eyepieces->Difference?

Post by Scarodactyl »

Yeah. I'd definitely recommend the 10x/22 eyepieces. Thry are not only wider, but seem to have alightly better color correction, which is odd.

Soki
Posts: 76
Joined: Sun May 03, 2020 5:05 am

Re: Nikon CFW & CFWN eyepieces->Difference?

Post by Soki »

Hey,

I found some of these 10/22 on eBay, thanks!
But why have the eyepieces Colour correction? My Nikon CFN Planapos are fully corrected. I thought that the Nikon eyepieces do not correct any CA.

Thanks
Simon

viktor j nilsson
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Re: Nikon CFW & CFWN eyepieces->Difference?

Post by viktor j nilsson »

Eyepieces need to be corrected for many different abberrations in order to be optically 'neutral'...

Scarodactyl
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Re: Nikon CFW & CFWN eyepieces->Difference?

Post by Scarodactyl »

Soki wrote:
Sat Feb 06, 2021 4:13 am
Hey,

I found some of these 10/22 on eBay, thanks!
But why have the eyepieces Colour correction? My Nikon CFN Planapos are fully corrected. I thought that the Nikon eyepieces do not correct any CA.

Thanks
Simon
The nikon eyepieces seem to add a bit of their own CA, which is weird.

dolmadis
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Location: UK

Re: Nikon CFW & CFWN eyepieces->Difference?

Post by dolmadis »

viktor j nilsson wrote:
Fri Feb 05, 2021 5:03 pm
But there are also some generic Chinese 10x/22 eyepieces that perform really well with Nikon CF objectives.
Do you still have a note of the source or the generic description to hand please?

Thanks

John

viktor j nilsson
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Location: Lund, Sweden

Re: Nikon CFW & CFWN eyepieces->Difference?

Post by viktor j nilsson »

dolmadis wrote:
Sat Feb 06, 2021 10:51 am
viktor j nilsson wrote:
Fri Feb 05, 2021 5:03 pm
But there are also some generic Chinese 10x/22 eyepieces that perform really well with Nikon CF objectives.
Do you still have a note of the source or the generic description to hand please?

Thanks

John
Here you go:
http://www.microbehunter.com/microscopy ... 14&t=10094

And here:
https://www.photomacrography.net/forum/ ... 25&t=40224

Soki
Posts: 76
Joined: Sun May 03, 2020 5:05 am

Re: Nikon CFW & CFWN eyepieces->Difference?

Post by Soki »

Thank you!

I ordered a pair of these:

https://www.ebay.de/itm/WF10X-22-Eyepie ... 4bb7974d8d

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