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L-eNhance Clip-In - max. aperture and ideal exposure time

astrophotography dslr filters equipment
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#1 skanker

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Posted 26 October 2020 - 08:27 AM

Hello :)

 

I plan to use my Canon 77Da + Sigma 105mm A f1.4 to photograph the the heart and the soul nebula.

I would like to use my l-eNhance clip filter and have two questions:

 

Can I use f1.8 without imaging problems with the l-enhance?

 

Do you think 2 minutes (ISO 800) are enough exposure time for one light frame?

 

CS

 

Gernot



#2 ERHAD

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Posted 26 October 2020 - 09:38 AM

I have recently imaged the H&S nebulas with half decent results. I can't help with the behaviour of the filter with fast lenses, but with regards to the exposure,I shot my Canon R (modded) at f/5.5, iso 1600 and 2 min subs with the L-enhance from my Bortle 8 sky.

 

The image attached is a 6 hour integration (considerably better that the 3 hour integration I originally had). I don't know what your skies are like, but 2 minutes at f 1.4 might be a bit much and saturate some stars and some of the core area...

 

My 2 cents

Attached Thumbnails

  • Screenshot 2020-10-21 at 09.14.26.jpg

Edited by ERHAD, 26 October 2020 - 09:39 AM.

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#3 grozmaistor

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Posted 26 October 2020 - 09:58 AM

Hello :)

I plan to use my Canon 77Da + Sigma 105mm A f1.4 to photograph the the heart and the soul nebula.
I would like to use my l-eNhance clip filter and have two questions:

Can I use f1.8 without imaging problems with the l-enhance?

Do you think 2 minutes (ISO 800) are enough exposure time for one light frame?

CS

Gernot

Hi , 2 minutes will be enough on ISO800, because a minute and a half are enough with the same canon, but NOT modified!, and same filter on ISO1600 and f/6.

I would even go with ISO 400. And increase the f number more. I don't know if f/1.8 will be good for astro. (What are the levels of chromatic abberation and astygmatyzm?)

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Edited by grozmaistor, 26 October 2020 - 10:02 AM.

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#4 skanker

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Posted 26 October 2020 - 02:01 PM

Thank you for your answers!

 

The lens can be used with aperture f1.8 for astrophotography. There is one limitation with my Astronomik h-alpha filter and it is f2.3.

 

I would like to know if there is a similar restriction with the Optolong filters.

 

CS


Edited by skanker, 26 October 2020 - 02:01 PM.



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