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the Bahtinov has just been improved !!!

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SteveL

SteveL

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whoah! thats a seriosly cool bit of software to help with the already spot on Bahtinov masks. Just added that to my software list, will try it with Maxim next time I get out... if ever!

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steppenwolf

steppenwolf

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Some way down the link provided above there is reference to a 'bahtinov-grabber'. This allows you to check any image, not just one captured by a webcam. For anyone interested in testing this out, the following three images may be of some assistance - the grabber worked very convincingly:-

Focusout.jpg

Focusin.jpg

okfocus.jpg

focusok.jpg

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beamish

beamish

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That's right Steve, sorry I should have said, there are 2x apps available on the link;

Bahtinov Focus.zip and Bahtinov Grabber.zip (download the one available on Page 2 of the thread)

The grabber is for poor saps like myself that don't have live view with their DSLR's :cool:

The Bahtinov Focus Aid is for w/cams etc with live preview images.

Karlo

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steppenwolf

steppenwolf

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I tried this software out last night and it certainly shows promise - it does give different results with slightly different pixel error reports when you use different size selection boxes' and I noted that taking a continuous stream of images without changing the focus also resulted in varying error reports but in my tests it did accurately identify the focus sweet spot when within 0.5 - 0.8 of a pixel and if it is reporting accurately then I doubt the human eye could detect that amount of error quite as well!

Taking large images with my M25C did result in a bit of processor conflict on my oldish 1.8GHz Pentium based PC but I should have tried a reduced pixel count capture as this would have sped up the download times.

It certainly works, clever stuff!

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Dangerous-Dave

Dangerous-Dave

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Nice idea, but doesn't this go against the idea of what the Bahtinov is about - ie simple, accurate, software-free focusing? If you're going to use analysis tools to focus, then why not use FWHM calculation in MaximDL et al? Is a perfect Bahtinov pattern more accurate than using FWHM?

Sorry if I'm being dense. :cool:

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beamish

beamish

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I agree Peter, I used it last night and was very impressed at how very very quick it was to open up read, confirm focus and close !

DD, for someone like me, this quick, visual affirmation is just perfect-not as complex as the FWHM method. I feel "comfortable" with it.

Karlo

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Dangerous-Dave

Dangerous-Dave

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I agree Peter, I used it last night and was very impressed at how very very quick it was to open up read, confirm focus and close !

DD, for someone like me, this quick, visual affirmation is just perfect-not as complex as the FWHM method. I feel "comfortable" with it.

Karlo

I agree Karlo, I don't like unnecessary faff. Was just trying to ascertain whether analysing the Bahtinov pattern was as much hassle as FWHM. I should stop being lazy and d/l the software. :cool:

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Psychobilly

Psychobilly

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One thing it did show up was how much the focus moves when you nip up the screw on the Megrez72...

It went from 0.06 pixel error to 0.62...

I like they way its works by processing an area of the screen so anything that can put an image on the screen can be "analysed"...

Peter....

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Dangerous-Dave

Dangerous-Dave

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Get it D/l'd DD and give it a try :cool:

get it here, Michael Morris made some suggestions that were taken up.

Telescope Reviews: Bahtinov focusser: free software tool

Karlo

Apologies for being lazy, I downloaded the tool last night and gave it a try with my SXV-H9 running under MaximDL. It's a real cinch to use, you just draw a box round your Bahtinov pattern in your capture application and Bob's your uncle...only 32KB in size as well. I kept it open in the background, and just alt + tabbed it forwards when I needed to check the Bahtinov pattern. I got it a lot more accurate than I usually would by eye, though I did reach the point where I couldn't get within more than 1 or 2 pixels and thought "s-d it, that'll do!".

Obviously, it's going to be less use for anyone who doesn't use a laptop to capture their images but for those who do - essential stuff.

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