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Using a 2" L'eNhance with EF lens

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#1 ParagPA

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Posted 15 November 2019 - 05:10 PM

Hello,

Just bought a 2" L'enhance tri-band filter. I'll typically use is attached to my field flattener. However, I also use wider field EF lenses. Is there any way to use this filter with those?

Thanks!

#2 kel123

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Posted 16 November 2019 - 06:27 AM

2" L'enhance is a dual band filter, not a 2" tri-band filter .I hope there is no deception from the seller?

The only theoretical way to use that size on a DSLR is to get a step down converter and convert from the size of your lens to 2".
However, depending on the size of your lens objective, there may be some vignetting

#3 ParagPA

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Posted 16 November 2019 - 07:25 AM

2" L'enhance is a dual band filter, not a 2" tri-band filter .I hope there is no deception from the seller?

The only theoretical way to use that size on a DSLR is to get a step down converter and convert from the size of your lens to 2".
However, depending on the size of your lens objective, there may be some vignetting

Thanks! Since it isolates Ha, Hb, and O-III, isn’t it a tri-band? 



#4 8472

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Posted 16 November 2019 - 09:37 AM

Nope.

 

Hb and O-III are grouped into a single band.



#5 kel123

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Posted 16 November 2019 - 09:50 AM

Thanks! Since it isolates Ha, Hb, and O-III, isn’t it a tri-band? 

Unfortunately, practically, it is a dual band filter. When you look at the graph, you will know why the manufacturer and everyone else calls it a dual band filter despite the literature noting "isolation of Hb" when it is included in O-III band .

 

Unless, of course it makes you feel good to say you own a tri-band filter smile.gif  when you do not.  If you really need one, it will set you back by almost $800 not just about the $200 you paid for the L'enhance.

 

After reading your post, I thought for a moment that the brand is out with a tri-band filter. Had to figure out you rechristened it all by yourself. 

 

Clear Skies



#6 ParagPA

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Posted 16 November 2019 - 11:51 AM

Unfortunately, practically, it is a dual band filter. When you look at the graph, you will know why the manufacturer and everyone else calls it a dual band filter despite the literature noting "isolation of Hb" when it is included in O-III band .

Unless, of course it makes you feel good to say you own a tri-band filter smile.gif when you do not. If you really need one, it will set you back by almost $800 not just about the $200 you paid for the L'enhance.

After reading your post, I thought for a moment that the brand is out with a tri-band filter. Had to figure out you rechristened it all by yourself.

Clear Skies



Lol yep! Definitely my mistake. And I just looked at the curves and see what you and others mean.

I couldn't find an APS-C clip in version of this filter - I assume that doesn't exist?

#7 DubbelDerp

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Posted 16 November 2019 - 12:35 PM

I wouldn’t worry too much about making that mistake... after all, this one is called a tri-band filter.

https://optcorp.com/...1c4d66c79eb455c

I don’t think optolong makes a clip-in version, but STC has a similar dual band clip-in filter.

#8 kel123

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Posted 16 November 2019 - 12:54 PM

I wouldn’t worry too much about making that mistake... after all, this one is called a tri-band filter.

https://optcorp.com/...1c4d66c79eb455c

I don’t think optolong makes a clip-in version, but STC has a similar dual band clip-in filter.


Sure. STC makes both the clip-in version and the camera lens version. I own the 2" version from STC but I almost regretted buying it for $330 USD because as soon as it was delivered, L'Enhance was released for much cheaper. Great filter though but I think I should have saved that $100


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