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

 
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 17 Nov 2009 (Tuesday) 08:55
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

Cleaning focusing screen

 
tommibear99
Member
31 posts
Joined Jan 2007
     
Nov 17, 2009 15:45 as a reply to  @ post 9032092 |  #16

No, the price of the Canon focus screens are extremely cheap from the Canon Parts Center. T1i focus screens are $1.98/ea and Canon 40D/50D focus screens are $2.00/ea. Shipping is $6 UPS regardless of order size.

In the past, they used to package the focus screens in individual plastic bags wrapped between soft dustless sheets. However, recently, they started to package the focus screens in small plastic "boxes" which houses 5 focus screen. It saves them money since they focus screens are no longer wrapped individually, however, I found that there are "more" dust on them!

I recently got a pack of 5 for my T1i; out of the 5, only 1 had no imperfections -- the rest either had small black dots or micro-scratches on them.




  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
TeamSpeed
01010100 01010011
Avatar
40,173 posts
Gallery: 116 photos
Best ofs: 2
Likes: 8460
Joined May 2002
Location: Midwest
     
Nov 17, 2009 16:16 |  #17

@amfoto1, please do not quote me out of context. I never said to put a naked qtip in there, if you read my post again, you will see what I did. It works and quite successfully. There is no part of the original qtip exposed, and I use a qtip because there is really nothing there that could scratch anything if you inadvertantly do something silly.


Past Equipment | My Personal Gallery (external link) My Business Gallery (external link)
"Man only has 5 senses, and sometimes not even that, so if they define the world, the universe, the dimensions of existence, and spirituality with just these limited senses, their view of what-is and what-can-be is very myopic indeed and they are doomed, now and forever."

  
  LOG IN TO REPLY
Ianfp
Goldmember
Avatar
1,775 posts
Gallery: 2 photos
Likes: 8
Joined Apr 2006
Location: UK
     
Nov 17, 2009 16:18 |  #18

I washed my focus screen under warm running water and detergent and then blow dried it with a Rocket Blower. Sounds crazy I know, but I had a spare grid screen and the standard screen with a stain on it. So if it all went pear shaped, I would just fit the grid screen. However, it worked really well and left the screen in pristine condition.


Ian
Nikon D850, 85mm f/1.4G
5D2
EF17-40 f/4.0 L, EF135 f/2.0L EF200 f/2.8L

EF24-105L, EF100 f/2.8L Macro. EOS-M, 22mm f/2
Hasselblad 500C/M, Planar 80mm f/2.8

  
  LOG IN TO REPLY
gjl711
"spouting off stupid things"
Avatar
56,638 posts
Likes: 3343
Joined Aug 2006
Location: Deep in the heart of Texas
     
Nov 17, 2009 18:36 |  #19

If you wash the focus screen with water, rinse it thoroughly with distilled water several times and let it air dry suspended by a corner. All water from a tap has minerals and will leave a film.


Not sure why, but call me JJ.
I used to hate math but then I realised decimals have a point.
.
::Flickr:: (external link)
::Gear::

  
  LOG IN TO REPLY
TeamSpeed
01010100 01010011
Avatar
40,173 posts
Gallery: 116 photos
Best ofs: 2
Likes: 8460
Joined May 2002
Location: Midwest
     
Nov 17, 2009 19:48 |  #20

gjl711 wrote in post #9033275 (external link)
If you wash the focus screen with water, rinse it thoroughly with distilled water several times and let it air dry suspended by a corner. All water from a tap has minerals and will leave a film.

It will only leave a film if you dont dab it dry or blow it forcibly dry. Evaporation is bad!


Past Equipment | My Personal Gallery (external link) My Business Gallery (external link)
"Man only has 5 senses, and sometimes not even that, so if they define the world, the universe, the dimensions of existence, and spirituality with just these limited senses, their view of what-is and what-can-be is very myopic indeed and they are doomed, now and forever."

  
  LOG IN TO REPLY
Matthew ­ Hicks ­ Photography
THREAD ­ STARTER
Goldmember
Avatar
2,552 posts
Likes: 3
Joined Nov 2007
Location: Calgary, Alberta, Canada
     
Nov 17, 2009 21:28 |  #21

I'll just add a precision matte screen into my cart at Adorama while I order my 1Ds Mark II, then...
This happened while we were playing around with an EF-S lens at work. We both own 5D Mark IIs, and the screen falls out, and he picks it up. Oy.


Calgary Wedding Photography by Matthew Hicks: www.matthicksphoto.com (external link)

  
  LOG IN TO REPLY
dpaessler
Member
Avatar
76 posts
Joined Oct 2007
Location: Kevil, KY
     
Nov 17, 2009 23:25 |  #22

Trainboy,
If you friend touched the underside of the actual focusing screen, he touched the fresnel lens side. I have successfully cleaned these with 90% denatured alcohol from the drug store. I first removed the focus screen from the camera, then holding it by the sides, I used a qtip saturated with alcohol to cover the focus screen. Next step was to "gently" roll the qtip across the focus screen several passes till you have covered it while still very wet with alcohol. Next I dried it with several qtips again by rolling them, not scrubbing them across the screen. This WILL leave qtip lint on the screen so don't get anal about this stage. I did the same to the ground glass top and when done, blew them off well with a rocket blower. After checking it with a 8x loupe, I reinstalled it in the camera with tweezers (the replacement screens come with a nifty pair) and it was clean as a pin. I also have 35 years as a tech working on equipment large and small. Your skill level may vary. I agree, focus screens are reasonably priced and replacement is a viable option if you are not comfortable with the skills involved. The lower surface of the screen is a VERY sensitive surface easily damaged by too much pressure, but not impossible to clean if not physically damaged.
David




  
  LOG IN TO REPLY
rguil15
Junior Member
29 posts
Joined Apr 2008
     
Nov 20, 2009 09:22 |  #23

Bill Boehme wrote in post #9032092 (external link)
Get a better friend. :lol:

I hooted when I read about using a t-shirt to dry the screen.

I mean I figured, old soft T shirt, nothing better to wipe or dry with right? :confused:




  
  LOG IN TO REPLY
TeamSpeed
01010100 01010011
Avatar
40,173 posts
Gallery: 116 photos
Best ofs: 2
Likes: 8460
Joined May 2002
Location: Midwest
     
Nov 20, 2009 09:44 |  #24

rguil15 wrote in post #9049892 (external link)
I mean I figured, old soft T shirt, nothing better to wipe or dry with right? :confused:

If it was 100% cotton, probably nothing too bad about that. We corvette fanatics won't let anything but 100% cotton or microfibers touch our cars, that and Zaino (or equivalent)!


Past Equipment | My Personal Gallery (external link) My Business Gallery (external link)
"Man only has 5 senses, and sometimes not even that, so if they define the world, the universe, the dimensions of existence, and spirituality with just these limited senses, their view of what-is and what-can-be is very myopic indeed and they are doomed, now and forever."

  
  LOG IN TO REPLY
Wilt
Reader's Digest Condensed version of War and Peace [POTN Vol 1]
Avatar
45,674 posts
Gallery: 1 photo
Likes: 3980
Joined Aug 2005
Location: Belmont, CA
     
Nov 20, 2009 15:39 |  #25

TeamSpeed wrote in post #9033626 (external link)
It will only leave a film if you dont dab it dry or blow it forcibly dry. Evaporation is bad!

Never dab a focusing screen to dry...you chance leaving dust or lint if you do not manage to damage the fragile focusing surface. Distilled water rinse and air dry is best!

A good amount of time dipped in water with some dishwashing detergent (oil emulsifier) or in alcohol can remove finger oils.


You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.p​hp
Canon dSLR system, Olympus OM 35mm system, Bronica ETRSi 645 system, Horseman LS 4x5 system, Metz flashes, Dynalite studio lighting, and too many accessories to mention

  
  LOG IN TO REPLY
bohdank
Cream of the Crop
Avatar
14,060 posts
Likes: 6
Joined Jan 2008
Location: Montreal, Canada
     
Nov 20, 2009 16:19 |  #26

tommibear99 wrote in post #9032286 (external link)
No, the price of the Canon focus screens are extremely cheap from the Canon Parts Center. T1i focus screens are $1.98/ea and Canon 40D/50D focus screens are $2.00/ea. Shipping is $6 UPS regardless of order size.

In the past, they used to package the focus screens in individual plastic bags wrapped between soft dustless sheets. However, recently, they started to package the focus screens in small plastic "boxes" which houses 5 focus screen. It saves them money since they focus screens are no longer wrapped individually, however, I found that there are "more" dust on them!

I recently got a pack of 5 for my T1i; out of the 5, only 1 had no imperfections -- the rest either had small black dots or micro-scratches on them.

I had a 40D focusing screen and they come in a clear plastic box with a removal tool and cost considerably more than $2..more like $35.

You must be talking ahout something other than a focussing screen, I think.


Bohdan - I may be, and probably am, completely wrong.
Gear List

Montreal Concert, Event and Portrait Photographer (external link)
Flickr (external link)

  
  LOG IN TO REPLY
Mark_48
Goldmember
Avatar
2,068 posts
Joined Nov 2004
Location: Brookfield, MA
     
Nov 20, 2009 16:39 |  #27

bohdank wrote in post #9052252 (external link)
I had a 40D focusing screen and they come in a clear plastic box with a removal tool and cost considerably more than $2..more like $35.

You must be talking ahout something other than a focussing screen, I think.

Focus screen $2.00. Removal tool $33. :lol::lol::lol:

Yeah, I find it hard to believe the focus screen could be only $2.00


Megapixels and high ISO are a digital photographers heroin. Once you have a little, you just want more and more. It doesn't stop until your bank account is run dry.

  
  LOG IN TO REPLY
gte357s
Senior Member
489 posts
Joined Mar 2009
     
Nov 20, 2009 18:01 as a reply to  @ Mark_48's post |  #28

I have some dust in the view finder, so I order a new focusing screen with the grid. I got it today and replace it, unfortunately, the dust is "inside" somewhere. After I remove the focusing screen, I can see those dust, but doesn't come off with the blower, so, I bravely try to remove it with my Pentax sensor cleaning stick, it's like a stick with a sticky tip. Since it is for cleaning sensor, I think it is safe to use it a bit on that thing. However, after a couple unsuccessful tries, I concluded that the dust is in the inside. It seems there is a piece of plastic covering the space, and the dust is sitting right on top of the plastic.

sad :(

I got this 5D used, I don't know how the dust can get into it. Is it a sign that the owner doesn't take care of this camera carefully?

Also, is it safe to clean the mirror with lens paper or microfiber cloth?


Canon 5D MK I | Canon 24-70 F2.8 L | Canon 70-200 F2.8 L IS I | Sigma 85 F1.4 | Tamron 1.4x TC | Canon 430 EXII

  
  LOG IN TO REPLY
tommibear99
Member
31 posts
Joined Jan 2007
     
Nov 20, 2009 18:26 |  #29

bohdank wrote in post #9052252 (external link)
I had a 40D focusing screen and they come in a clear plastic box with a removal tool and cost considerably more than $2..more like $35.

You must be talking ahout something other than a focussing screen, I think.

No, the focus screen for the 40D/50D were only $2 at the Canon Parts Center. However, you need to buy 5 of them. It doesn't come in a "nice" case or have the removal tool.




  
  LOG IN TO REPLY
TeamSpeed
01010100 01010011
Avatar
40,173 posts
Gallery: 116 photos
Best ofs: 2
Likes: 8460
Joined May 2002
Location: Midwest
     
Nov 20, 2009 18:30 |  #30

Wilt wrote in post #9052019 (external link)
Never dab a focusing screen to dry...you chance leaving dust or lint if you do not manage to damage the fragile focusing surface. Distilled water rinse and air dry is best!

A good amount of time dipped in water with some dishwashing detergent (oil emulsifier) or in alcohol can remove finger oils.

I guess I have just been lucky with the last 4 screens I have cleaned. Oh well, ignorance is indeed bliss.


Past Equipment | My Personal Gallery (external link) My Business Gallery (external link)
"Man only has 5 senses, and sometimes not even that, so if they define the world, the universe, the dimensions of existence, and spirituality with just these limited senses, their view of what-is and what-can-be is very myopic indeed and they are doomed, now and forever."

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

7,609 views & 0 likes for this thread
Cleaning focusing screen
FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


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


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is 1Frizzies-1953
323 guests, 227 members online
Simultaneous users record so far is 15144, that happened on Nov 22, 2018

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.