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Bahtinov focussing - Live view

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11 replies to this topic

#1 F.Meiresonne

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Posted 05 December 2019 - 08:55 PM

Yesterday i tried my Bahtinov mask to focus  on capella. It just did not work. through live view , i could see Capella as a point lacking the spikes i needed to focus it..

Racking the focusser in and out only changed Capella to out of focus or in focus, but no spikes.

 

Eventually i gave up and just focussed without Bahtinov with live view until i have a pinpoint Capella.

I took my pictures.

Sharpness then was not bad

 

But how do i get the spikes?Otherwise i see no point in using a Bahtinov mask....

 



#2 Michael Harris

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Posted 05 December 2019 - 09:37 PM

In live view turn up the ISO as high as you can for focusing. Remember to turn it back down for imaging!



#3 zxx

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Posted 05 December 2019 - 10:27 PM

I take 10s pics then adjust, it's a pain but it works. Turning up the iso in live view with my K50 does not work, unless I'm missing something.


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#4 AZ Maverick

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Posted 05 December 2019 - 10:50 PM

You didn't say what software you are using to view your image or if you are just viewing it on camera, but either way you need to make sure you are zoomed in (way in) in order to see the spike.

Here is what the Bahtinov mask spikes look like on my Nikon D90 zoomed way in on Vega:

 

169725142.gvKzYS3M.jpg

 

169726944.rB6JVtJk.Capture1.JPG


Edited by AZ Maverick, 05 December 2019 - 10:50 PM.

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#5 Traveler

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Posted 06 December 2019 - 12:30 AM

@AZ: That Bathinov aid, does it come with  APT?



#6 F.Meiresonne

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Posted 06 December 2019 - 05:43 AM

Software : none

 

i use the camera's live view. So i have to zoom in, ok. It crossed my mind only after the session.

 

Thanks, next time i will try it. How much let your camera zoom in, i believe i am limited to 5x or maybe 10x on my eos



#7 kathyastro

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Posted 06 December 2019 - 08:25 AM

How much let your camera zoom in, i believe i am limited to 5x or maybe 10x on my eos

Use the maximum zoom your camera will give you.


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#8 F.Meiresonne

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Posted 06 December 2019 - 10:30 AM

Thanks Kathy,

 

I sure will try next time...

 

Unfortunately the weather is not very co√∂perative lately...automn, rain, wind ....can take weeks again for a clear night...and i may just be too tired after work..to put the gear out.

Glad i took a not heavy equipment ...

2.5 years to go for retirement...then i should have plenty of time on every clear night that comes along...grin.gif



#9 AZ Maverick

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Posted 06 December 2019 - 11:00 AM

@AZ: That Bathinov aid, does it come with  APT?

 

Yes, the Bahtinov aid is part of the APT software - I think it works great.


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#10 AZ Maverick

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Posted 06 December 2019 - 11:03 AM

Software : none

 

i use the camera's live view. So i have to zoom in, ok. It crossed my mind only after the session.

 

Thanks, next time i will try it. How much let your camera zoom in, i believe i am limited to 5x or maybe 10x on my eos

Zoom in as much as you can get!!!

Admittedly, the more you zoom in the harder it is to keep the image centered - but the more you zoom in the easier it is to see the spikes.


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#11 F.Meiresonne

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Posted 06 December 2019 - 11:24 AM

Zoom in as much as you can get!!!

Admittedly, the more you zoom in the harder it is to keep the image centered - but the more you zoom in the easier it is to see the spikes.

I just checked the EOS, it is 10x that is the maximum...



#12 AZ Maverick

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Posted 06 December 2019 - 11:37 AM

I just checked the EOS, it is 10x that is the maximum...

That should be enough - the max zoom in Live View on my Nikon D90 is 6.7x and that works fine.


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