Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

Revolutionary new way of focusing! No less!

This topic has been archived. This means that you cannot reply to this topic.
517 replies to this topic

#476 ChrisofAmpthill

ChrisofAmpthill

    Lift Off

  • -----
  • Posts: 1
  • Joined: 17 Feb 2007

Posted 05 January 2009 - 07:22 AM

A truly amazing thread with brain waves from Russia and unstinting contributions from arround the world.
Have followed all the contibutions and have printed off two versions for my F1100mm 150mm refractor with differant slot widths using the X3 factor. Before making one I have not been able to resolve a question re the relationship between the left hand slots and angled slots. In some posts the RH and LH slots appear to meet on the central bar and in other posts they appear to diverge between the middle and the top or bottom. Apologies for being long winded, have I missed something, is it unimportant.

#477 greeps

greeps

    Explorer 1

  • *****
  • Posts: 71
  • Joined: 04 Feb 2006

Posted 05 January 2009 - 07:27 PM

Before making one I have not been able to resolve a question re the relationship between the left hand slots and angled slots. In some posts the RH and LH slots appear to meet on the central bar and in other posts they appear to diverge between the middle and the top or bottom. Apologies for being long winded, have I missed something, is it unimportant.


It doesn't matter. The important things are that there are 3 sets of slots and that they are angled appropriately. The actual configuration of the slots, whether they meet, whether there is that triangle without the slots, and the central circle just doesn't matter. I suspect each different configuration you see here will slightly affect the brightness of the diffraction spikes and the more "open" space (space devoted to openings) you have the brighter, but the bottom line is that it doesn't matter. You'll adjust your exposure based on the brightness of the star and the brightness of the spikes anyway, so you'll compensate, and a design that causes an exposure change of a half second or so just doesn't matter.

They all work and they're amazing. I'd suggest you just pick any of the designs you like and go for it. I'm sure that once you try it you'll be hooked, just like the rest of us.

David

#478 FarmerDave

FarmerDave

    Messenger

  • *****
  • Posts: 481
  • Joined: 07 Sep 2007

Posted 05 January 2009 - 09:26 PM

They all work and they're amazing. I'd suggest you just pick any of the designs you like and go for it. I'm sure that once you try it you'll be hooked, just like the rest of us.

David


Gosh, David, you make it sound like a cult or something. :)

David

#479 Jerry3672

Jerry3672

    Vendor - Quantum Astronomy Products

  • *****
  • Vendors
  • Posts: 501
  • Joined: 20 Jan 2008

Posted 05 January 2009 - 09:41 PM

That would make You(FarmerDave) one of the cult leaders. :bow::roflmao:

#480 FarmerDave

FarmerDave

    Messenger

  • *****
  • Posts: 481
  • Joined: 07 Sep 2007

Posted 06 January 2009 - 08:41 AM

That would make You(FarmerDave) one of the cult leaders. :bow::roflmao:


Me? Nah, I'm just an enabler. ;)

Dennis, Adam, John and you are the real culprits on this thread. :)

:step:

#481 Dennis Sakva

Dennis Sakva

    Apollo

  • *****
  • topic starter
  • Posts: 1,477
  • Joined: 19 Oct 2004

Posted 06 January 2009 - 09:40 AM

I'll take "The messenger" role, John and Jerry be "The Makers", and Pavel "He who started it all" :flexible:

#482 Jerry3672

Jerry3672

    Vendor - Quantum Astronomy Products

  • *****
  • Vendors
  • Posts: 501
  • Joined: 20 Jan 2008

Posted 06 January 2009 - 12:35 PM

No argument here.

Pavel Bahtinov is the “Master” of the cult.

#483 TimberRock

TimberRock

    Lift Off

  • -----
  • Posts: 16
  • Joined: 15 Nov 2007

Posted 14 January 2009 - 01:15 AM

Has anyone tried to print a mask on transparency film? If so, does it work?

#484 lawrie

lawrie

    Vanguard

  • *****
  • Posts: 2,217
  • Joined: 31 Jan 2006

Posted 14 January 2009 - 01:52 AM

Yes I have.
They print just fine, but don't work to well out in the field, they tend to dew up quite quickly, and if its cold the dew freezes. I ended up using them as templates, for cut outs on pail lids, which is fairly thick plastic.

#485 Trebor777

Trebor777

    Hazy

  • *****
  • Posts: 1,212
  • Joined: 04 Jan 2008

Posted 14 January 2009 - 04:44 AM

I made one for my 80mm APO. $2.79 at Staples - I purchased a heavy duty black folder.

Printed up a template on regular paper, cut it out with an exacto knife, traced it onto the black folder, cut that out with an exacto knife. It took me a little while to do all the cutting with the knife, but it came out perfect.

#486 TimberRock

TimberRock

    Lift Off

  • -----
  • Posts: 16
  • Joined: 15 Nov 2007

Posted 14 January 2009 - 03:42 PM

When there is no dew on them, do they work well or....?

#487 greeps

greeps

    Explorer 1

  • *****
  • Posts: 71
  • Joined: 04 Feb 2006

Posted 14 January 2009 - 05:54 PM

Jerry, I just got my Spike-a-com Bahtinov mask this morning. It's outstanding. It's rigid, sturdy, easy to attach, and looks like it'll last forever. Great job. Thanks.

David

#488 smokin oakum

smokin oakum

    Surveyor 1

  • *****
  • Posts: 1,529
  • Joined: 24 Sep 2007

Posted 23 January 2009 - 12:17 PM

Hi all...I just thought that the group would like to see this masks result with a Mallincam video camera. It truly make focusing a snap

Neil

Attached Thumbnails

  • 2882943-mask.jpg


#489 bill w

bill w

    Voyager 1

  • *****
  • Posts: 11,381
  • Joined: 26 Mar 2005

Posted 10 February 2009 - 02:48 PM

figured i'd give this thread a bump as someone asked what i used for my FS 60C

i used the bahtinov mask generator here:
http://astrojargon.n...kGenerator.aspx
using FL 354 aperture 60 bahtinov factor 50
to generate the mask:
http://whwastro.home...4_BFact_50_.svg
printed on normal paper with inkscape (freeware), cut out with an exacto knife on a plastic cutting board, and cut out a bread crumb container for the cylinder (had to open the cylinder as it wasn't quite big enough).

it isn't pretty:
Posted Image

but it gives a nice focus pattern, even using the reducer at different FL:
Posted Image

as mentioned before
don't use on DSO's:lol:
Posted Image

#490 Dr Benway

Dr Benway

    Vendor - 3D Printed Parts

  • *****
  • Vendors
  • Posts: 696
  • Joined: 27 Mar 2008

Posted 11 February 2009 - 08:44 AM

I made one a few weeks ago for use with my C8 Hyperstar3. I like it a lot better than the Hartmann Mask.

Attached Thumbnails

  • 2921058-P1010058.jpg


#491 amateur

amateur

    Messenger

  • *****
  • Posts: 413
  • Joined: 15 Jun 2006

Posted 15 February 2009 - 08:00 AM

Almost the same, achieved with minimal means: Bahtinov wires

#492 astrokido

astrokido

    space wanderer

  • *****
  • Posts: 798
  • Joined: 09 Jun 2008

Posted 19 February 2009 - 12:38 AM

I got some good results with a 210mm f/4 camera lens and the free 66ED mask template from Focus-Mask which was sized just right. Here's a shot of Venus with it from tonight:

Posted Image

Taken at ISO200, 2sec, f/4. The mask didn't work at shorter FLs but I'm going to make a thinner one and see what happens.

#493 starbob1

starbob1

    Vanguard

  • *****
  • Posts: 2,077
  • Joined: 11 Mar 2007

Posted 23 February 2009 - 11:24 AM

Where can one get a Bahtinov mask for a TSA 102MM.Thanks

#494 raf1

raf1

    Apollo

  • *****
  • Posts: 1,335
  • Joined: 18 Nov 2005

Posted 23 February 2009 - 11:52 AM

Go here:http://www.focus-mask.com/index.html

Darrell can make about any mask you need.

#495 starbob1

starbob1

    Vanguard

  • *****
  • Posts: 2,077
  • Joined: 11 Mar 2007

Posted 23 February 2009 - 12:38 PM

Thanks RAF1

#496 Freddy WILLEMS

Freddy WILLEMS

    Fly Me to the Moon

  • *****
  • Posts: 7,364
  • Joined: 13 Nov 2005

Posted 26 February 2009 - 03:37 AM

I did not read the whole threat, but is there somebody who can make one for a C14" ?
I do not have the materials but if that person or company has Paypal I would love to order one.
Shipped to Hawaii.
Freddy

#497 Dennis Sakva

Dennis Sakva

    Apollo

  • *****
  • topic starter
  • Posts: 1,477
  • Joined: 19 Oct 2004

Posted 26 February 2009 - 04:59 AM

No need to read 25 pages... Read last two comments :)

#498 John Wunderlin

John Wunderlin

    Vendor - Spike-a Focusing Mask

  • *****
  • Vendors
  • Posts: 2,480
  • Joined: 01 Oct 2004

Posted 26 February 2009 - 11:27 AM

I did not read the whole threat, but is there somebody who can make one for a C14"


We have made several masks of this size and have some being cut in the next week. PM me if you're interested.

#499 Dennis_Oz

Dennis_Oz

    Messenger

  • -----
  • Posts: 445
  • Joined: 20 Aug 2006

Posted 26 February 2009 - 07:10 PM

Here’s the "Digital" interpretation on CN Solar System Imaging & Processing…

Cheers

Dennis

#500 Chris Lord

Chris Lord

    Ranger 4

  • *****
  • Posts: 329
  • Joined: 26 Sep 2004

Posted 20 June 2009 - 12:19 PM

In all this enthusiasm, and mass production, has anyone actually run an FFT on the Bahtinov mask?


CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics