Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies. Read More.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial
Thread started 10 May 2017 (Wednesday) 18:34
Prev/next
sponsored links
(this ad will go away when you log in as registered member)

PF question

 
jgoetz4
Senior Member
jgoetz4's Avatar
Joined Dec 2005
Hanover, Pa-Baltimore, Md
May 10, 2017 18:34 |  #1

Good evening folks :)
Here's the question: If you use just a full frame (digital) camera, or, a crop camera (no eye pieces), would the diagonal of each sensor equal that of an an actual eye piece? A ff is 43.3mm, and a crop camera is 26.7mm. Just curious? Thanks in advance...


6D, SL1, 10-22 (modified for the 6D) 50 1.8 STM, Tamron 70-200 2.8 VC, 70-300L IS, Da Bigma, Kenko Pro 1.4x tc
Fuji X-E1 and a bunch of glass
Fuji X100
Sky-Watcher 8'' Dobsonian

LOG IN TO REPLY
SteveInNZ
Goldmember
1,415 posts
Joined Nov 2007
Auckland, New Zealand
May 11, 2017 20:39 |  #2

No. The eyepiece is a small microscope that you use to look at a part of the image formed by the telescope lens/mirror.

If you put a bit of tissue over the eyepiece hole of your telescope and pointed it at the moon, you'd see an image of the moon on the tissue. This is what the camera sensor sees. If you looked at that image on the tissue paper with a strong magnifying glass, you'd be doing what the eyepiece does.

Steve.


"Treat every photon with respect" - David Malin.

LOG IN TO REPLY
TCampbell
Senior Member
Joined Apr 2012
May 11, 2017 20:52 |  #3

Although... for purposes of calculating magnification... the focal length of the scope divided by the diagonal measure of the image sensor (43 or 27mm) actually works out to be the magnification factor. That's the same as the eyepiece (focal length of scope divided by focal length of eyepiece.)

So in that sense (calculating the magnification factor), they are the same.




LOG IN TO REPLY
MalVeauX
"Looks rough and well used"
MalVeauX's Avatar
Joined Feb 2013
Florida
May 12, 2017 04:53 |  #4

TCampbell wrote in post #18352381 (external link)
Although... for purposes of calculating magnification... the focal length of the scope divided by the diagonal measure of the image sensor (43 or 27mm) actually works out to be the magnification factor. That's the same as the eyepiece (focal length of scope divided by focal length of eyepiece.)

So in that sense (calculating the magnification factor), they are the same.

This.

Very best,


My Flickr (external link) :: My Astrobin (external link)

LOG IN TO REPLY
jgoetz4
THREAD ­ STARTER
Senior Member
jgoetz4's Avatar
Joined Dec 2005
Hanover, Pa-Baltimore, Md
May 12, 2017 05:19 |  #5

Thanks for all the responses :-) I thought the diagonal would have the same magnification as an eyepiece.
Jim...


6D, SL1, 10-22 (modified for the 6D) 50 1.8 STM, Tamron 70-200 2.8 VC, 70-300L IS, Da Bigma, Kenko Pro 1.4x tc
Fuji X-E1 and a bunch of glass
Fuji X100
Sky-Watcher 8'' Dobsonian

LOG IN TO REPLY

664 views & 2 likes for this thread
PF question
FORUMS Photo Sharing & Visual Enjoyment Astronomy & Celestial


Not a member yet? Click here to register to the forums.
Registered members get all the features: search, following threads, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, settings, view hosted photos, own reviews and more...


AAA

Send feedback to staff    •   Jump to forum...    •   Rules    •   Index    •   New posts    •   RTAT    •   'Best of'    •   Gallery    •   Gear    •   Reviews    •   Polls

COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies. Privacy policy and cookie usage info.

POWERED BY AMASS 1.4version 1.4
made in Finland
by Pekka Saarinen
for photography-on-the.net
Spent 0.00079 for 4 database queries.
PAGE COMPLETED IN 0.02s
Latest registered member is lookingglassphoto
1036 guests, 518 members online
Simultaneous users record so far is 6106, that happened on Jun 09, 2016