Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-31-2011, 08:40 PM   #1
Junior Member




Join Date: Jul 2010
Photos: Albums
Posts: 40
Telestar 135mm prime F2.8?

Can anyone share info about this lens.

Telesar 135mm F2.8 K-mount

I purchased it at an antique store for $12.50

It seems like a good lens. Focus ring is smooth. Aperture ring is crisp. Optics clean and no fog, chips or scratches. It hardly looks used.

It also has a secondary aperture ring that has no detent and is infinitely adjustable from where the detented ring is set out to 2.8

Is this a decent lens?

What is the purpose/advantage of having the secondary aperture ring?

12-31-2011, 08:54 PM   #2
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,289
QuoteOriginally posted by P12 Quote
It also has a secondary aperture ring that has no detent and is infinitely adjustable
This is most likely a pre-set lens. This means you set the aperture using the ring with the detents and then open the other ring fully in order to focus then close it down to the aperture you selected to actually take the picture. This allows more light into the viewfinder to allow you focus. This method was used before auto-aperture lenses were made and is also sometimes found on specialty lenses like a bellows lens.
12-31-2011, 09:00 PM   #3
Veteran Member
Philoslothical's Avatar

Join Date: May 2011
Posts: 1,723
This kind of two ring aperture lens is called a "preset". The second ring serves as a physical stop for the first, so you set both to the aperture you want to use, and then open up the first ring to focus, so your viewfinder is bright. Then you turn the first ring back til it gets stopped by the second, meter with the green button, and take your shot. It takes a lot less time to do, than to explain. You need to use this lens in M mode, which you're probably aware of.

I have no idea about the quality of this particular lens. I love the 135mm focal length though, and would get seriously addicted to collecting them if I could afford it. There are tonnes of nice old 135s out there, and as you found out, many are available for a song. You could post some sample pics when you try it out.
12-31-2011, 09:01 PM   #4
Pentaxian




Join Date: Dec 2009
Location: Dallas / Yucatan
Posts: 990
It sounds like a Preset lens. You set the aperture ring with "notches" where you want to shoot. You use the secondary ring to open the aperture fully to focus and compose. Then, when ready, you slide the secondary ring smoothly to the "catch" where it is at the "preset" aperture of the first ring, having pre-determined the exposure you wish to use.

It really isn't as complicated as it sounds when describing it. A preset lens in K-mount is a little unusual, as most preset lenses were M42 mounts.

Try it out, using Green Button metering and see what you think. Personally, I enjoy using such lenses. The little extra steps help me compose the shots better than the fully automatic lenses that allow you to just shoot away.

The preset lenses were almost always uncoated lenses, but perfectly good photos can be taken with them. The lack of lens coatings does mean that a lens hood is almost a requirement. Even further "hand" shading may help too.

12-31-2011, 09:53 PM   #5
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
Let me know if you don't like it. I'm queer for old presets. The older coatings, the iris placement -- these make for different renderings than newer glass. Yes, a hood is mandatory. But I love the 'period' feel of such lenses. If you tire of it, I'll give it a good home.
12-31-2011, 10:06 PM   #6
Pentaxian




Join Date: Dec 2009
Location: Dallas / Yucatan
Posts: 990
Oh, darn, Rico asked first.

01-01-2012, 07:25 PM   #7
P12
Junior Member




Join Date: Jul 2010
Photos: Albums
Posts: 40
Original Poster
Thanks for the info guys. I'm going to play with it this next weekend. I'll post some pics when I can. It seems like a cool lens.
02-25-2013, 05:40 AM   #8
New Member




Join Date: Feb 2013
Posts: 3
Telesar lens

Hey i have a telesar automatic telephoto 135mm f2.8 lens 18 degrees ? haha still in box and will take best offer? no idea if it is worth anuything.

02-25-2013, 05:41 AM   #9
New Member




Join Date: Feb 2013
Posts: 3
QuoteOriginally posted by yucatanPentax Quote
Oh, darn, Rico asked first.

i have one i believe
02-25-2013, 05:42 AM   #10
New Member




Join Date: Feb 2013
Posts: 3
QuoteOriginally posted by RioRico Quote
Let me know if you don't like it. I'm queer for old presets. The older coatings, the iris placement -- these make for different renderings than newer glass. Yes, a hood is mandatory. But I love the 'period' feel of such lenses. If you tire of it, I'll give it a good home.
i have one i believe
02-25-2013, 09:13 AM   #11
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,289
mpdiglio, welcome to the forum! You might want to check the date on threads before answering though, this thread is over a year old. Not everyone checks on old threads so if you comment or ask a question in one you might not get noticed. Just FYI, anyway welcome aboard.
02-25-2013, 10:38 AM   #12
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,304
QuoteOriginally posted by jatrax Quote
mpdiglio, welcome to the forum! You might want to check the date on threads before answering though, this thread is over a year old. Not everyone checks on old threads so if you comment or ask a question in one you might not get noticed. Just FYI, anyway welcome aboard.
And RioRico has not been able to post since June
02-25-2013, 11:24 AM   #13
Site Supporter
jatrax's Avatar

Join Date: May 2010
Location: Oregon
Photos: Gallery | Albums
Posts: 10,289
QuoteOriginally posted by boriscleto Quote
And RioRico has not been able to post since June
Any news on him? I fear the worst and that has really bothered me.
02-25-2013, 11:26 AM   #14
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,304
QuoteOriginally posted by jatrax Quote
Any news on him? I fear the worst and that has really bothered me.
Someone accesses his account once in a while. The last was in January.
02-25-2013, 11:42 AM   #15
Site Supporter
Jean Poitiers's Avatar

Join Date: Apr 2011
Location: Lost in translation ...
Photos: Gallery | Albums
Posts: 16,382
QuoteOriginally posted by jatrax Quote
Any news on him? I fear the worst and that has really bothered me.
Me, too ... has anyone heard anything about RioRico ... J
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
135mm, aperture, k-mount, lens, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
How's the idea of using extension cubes for doing macro work on 50mm and 135mm prime? benhai Pentax SLR Lens Discussion 6 09-27-2011 06:07 PM
For Sale - Sold: SMC Pentax-M 135mm f3.5 Prime Lens (US) aerodynamics Sold Items 6 10-25-2010 11:55 AM
85mm vs. 135mm prime sjwoo Troubleshooting and Beginner Help 23 03-25-2010 05:17 PM
Looking for a 135mm Prime Buddha Jones Pentax SLR Lens Discussion 12 11-08-2007 07:16 AM



All times are GMT -7. The time now is 04:22 AM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top