| View previous topic :: View next topic |
| Author |
Message |
martyn_bannister
Joined: 23 May 2010
Posts: 1151
|
 Posted: Tue Feb 21, 2012 6:00 pm Post subject: Tamron 28mm f2.8 - optical diagram? |
 |
|
martyn_bannister wrote:
Hi there,
I have a Tamron 28mm f2.8 which doesn't focus to infinity. It doesn't look like it's been tampered with, but the rear elements are easily removeable. So, if anyone has a link to an optical diagram for this lens I would appreciate it, so I can check they are all in their right places.
Thanks. |
|
| Back to top |
|
 |
Kathmandu
Joined: 09 Dec 2009
Posts: 1479
Location: (Kathmandu,Nepal. Currently)Pacific Northwest, USA
Expire: 2012-04-08
|
| Posted: Wed Feb 22, 2012 3:48 am Post subject: |
|
|
Kathmandu wrote:
What model is your lens? I am hoping they all share the same design.
Cheerio
_________________
kathmandu
Sony α 700 DSLR
 |
|
| Back to top |
|
|
martyn_bannister
Joined: 23 May 2010
Posts: 1151
|
| Posted: Wed Feb 22, 2012 6:46 am Post subject: |
|
|
martyn_bannister wrote:
Thanks for that diagram. The model of my lens seems to the CW-28 here. Your diagram confirms the rear 3 elements are indeed correct. But,as I say, no infinity focus. Looks like it must have been apart and the helicoid re-assembled incorrectly. I'll have to dig deeper. Ironic that the blurb tells me that everything is in focus at f16, whereas on my one, nothing is! Thanks again for the info. |
|
| Back to top |
|
|
Kathmandu
Joined: 09 Dec 2009
Posts: 1479
Location: (Kathmandu,Nepal. Currently)Pacific Northwest, USA
Expire: 2012-04-08
|
| Posted: Sat Feb 25, 2012 12:49 am Post subject: |
|
|
Kathmandu wrote:
| martyn_bannister wrote: |
| Thanks for that diagram. The model of my lens seems to the CW-28 here. Your diagram confirms the rear 3 elements are indeed correct. But,as I say, no infinity focus. Looks like it must have been apart and the helicoid re-assembled incorrectly. I'll have to dig deeper. Ironic that the blurb tells me that everything is in focus at f16, whereas on my one, nothing is! Thanks again for the info. |
You're wellcome- good idea to know how the elemens are stacked up-before getting your hands dirty.
_________________
kathmandu
Sony α 700 DSLR
|
|
| Back to top |
|
|
iangreenhalgh1
Joined: 18 Mar 2011
Posts: 15679
Expire: 2014-01-07
|
| Posted: Sat Feb 25, 2012 4:37 am Post subject: |
|
|
iangreenhalgh1 wrote:
I had one of these and it wasn't much good, might be better off leaving it and getting another 28.
_________________
I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
|
| Back to top |
|
|
Katastrofo
Joined: 26 Feb 2007
Posts: 10405
Location: USA
Expire: 2013-11-19
|
| Posted: Tue Feb 28, 2012 1:31 am Post subject: |
|
|
Katastrofo wrote:
I got this lens off the bay recently and ran a free roll of KG400 (thanks, Ron) through a Canon TLb
to check the meter. Got the camera body for $15 with good lightseals, meter works well with zinc air battery:
cropped square, shot at f4 (as I remember)
another square crop, KG400 colro:
Close focuses to 10", probably pretty close to that for this shot. Don't much like the colors of this film, but converts well.
Not ideal for portraits, but on a crop sensor DSLR, I think this lens will do quite well. |
|
| Back to top |
|
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Search
Memberlist
Register
Profile
Log in to check your private messages
Log in
