Go Back   IceInSpace > Equipment > Equipment Discussions
Register FAQ Calendar Today's Posts Search

Reply
 
Thread Tools Rate Thread
  #1  
Old 22-05-2015, 02:16 PM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,462
STL to EOS adapter

Hi all,

Wanting to use some EOS mount lenses on my STL camera, I came across this one http://www.tan14.com/Others.htm down the bottom of the page. Has anyone used this before, it should work right?

thanks
Josh
Reply With Quote
  #2  
Old 22-05-2015, 03:14 PM
Moon's Avatar
Moon (James)
This sentence is false

Moon is offline
 
Join Date: Oct 2008
Location: Melbourne
Posts: 1,147
Yes I have one of these. I suspect it slightly increases the distance to the focal plane. You should be able to reach focus with most lenses, but the results might not be perfect.
Obviously you will need to control the aperture manually as well.
James
Reply With Quote
  #3  
Old 22-05-2015, 03:23 PM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,462
Thanks James,
I guess this is a question for the distributor, but the flange focal distance of canon EF lenses and Sigma SA mount lenses is 44mm (which are the 2 lenses I want to use), so this adapter should extend the lens bayonet mount this far out from the STL chip and all should work well, have you not found this to be the case?

Josh
Reply With Quote
  #4  
Old 22-05-2015, 03:46 PM
Moon's Avatar
Moon (James)
This sentence is false

Moon is offline
 
Join Date: Oct 2008
Location: Melbourne
Posts: 1,147
I was being deliberately vague. I guess I won't get away with that. Check these out:

From the PDF A=1.559 - 0.275 inch = 32.16mm
From the pic = 13.8mm
Total=45.96 mm which is too much

It will/might work, but the lens won't be operating at the ideal distance to the focal plane.

James
Attached Thumbnails
Click for full-size image (IMG_2388.JPG)
48.0 KB7 views
Attached Files
File Type: pdf 2400_1001_basic_assy.pdf (79.0 KB, 2 views)

Last edited by Moon; 22-05-2015 at 03:56 PM. Reason: edited to fix my calculation of A
Reply With Quote
  #5  
Old 22-05-2015, 03:57 PM
Moon's Avatar
Moon (James)
This sentence is false

Moon is offline
 
Join Date: Oct 2008
Location: Melbourne
Posts: 1,147
sorry I had to edit my post above - I forgot you have to remove block from the front of the camera
Reply With Quote
  #6  
Old 22-05-2015, 03:58 PM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,462
Thanks for measuring the adapter for me James . Measurement A includes the width of the accessory mounting surface, this needs to be removed I'm sure(without going to my observatory) before the adapter is bolted on. It describes this in the bellow link.

So (using the optical focal plane as the back focus of the camera) we have:
(37.338mm) - (6.985mm - accessory mounting plate) = 30.353mm + 13.8mm = 44.153mm that seams all right to me.

Josh
Reply With Quote
  #7  
Old 22-05-2015, 03:59 PM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,462
haha, I see you edited as i was replying. All good James.
Reply With Quote
  #8  
Old 22-05-2015, 04:02 PM
Moon's Avatar
Moon (James)
This sentence is false

Moon is offline
 
Join Date: Oct 2008
Location: Melbourne
Posts: 1,147
Yes I think we were typing at the same time :-)

Any how, I got it to reach focus with my lens. If I can find an example image I will post.

Last edited by Moon; 22-05-2015 at 04:29 PM.
Reply With Quote
  #9  
Old 26-05-2015, 10:37 AM
Octane's Avatar
Octane (Humayun)
IIS Member #671

Octane is offline
 
Join Date: Dec 2005
Location: Canberra
Posts: 11,159
Yep, I bought one of these several years ago. I did some widefield testing with the Canon EF 200mm f/2.8L II USM and it worked beautifully.

H
Reply With Quote
  #10  
Old 26-05-2015, 11:30 AM
Joshua Bunn's Avatar
Joshua Bunn (Joshua)
Registered User

Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,462
Quote:
Originally Posted by Octane View Post
Yep, I bought one of these several years ago. I did some widefield testing with the Canon EF 200mm f/2.8L II USM and it worked beautifully.

H
Thankyou Humayun!
Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 12:55 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Testar
Advertisement