Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-30-2009, 04:27 PM   #1
Veteran Member




Join Date: Nov 2006
Location: Mission Hills, CA
Posts: 773
Softness With Tokina 500mm Mirror f8 ?

I have a mint Tokina 500mm f8, and it was good with film cameras but I can't get a SHARP image using my DS, my K10D (when I had it), or my K20D.

Is there something that I don't realize? I have shot it on a tripod, hand held with SR on/off. It maybe just that the depth of field is so short that it has to be perfect to be in focus ?

What have you guys experienced with a mirror lens.


wll

05-30-2009, 05:30 PM   #2
Site Supporter




Join Date: Sep 2006
Location: midwest, United States
Photos: Gallery
Posts: 3,222
Do you still have a film camera to try it on? Your lens may not be performing properly any more. Mirrors (most) can be knocked out of alignment.

I find mirrors do as well with digital if not better. Mirrors have lower contrast than other lenses. This is easy to adjust in post processing on digital. Mirrors have very few color aberations. Digital likes that.

Could you be using a very small /wobbly tripod or misfocusing? Does your mirror have a rear mounted filter that is supposed to be used missing? Is the focus off or is it not sharp anywhere?
Good luck.

thanks
barondla

Check out POINT & SHOOT CONTEST #18 WINNER in compact camera forum. Enter #19. Any brand camera. Ending soon. Enter now!
05-30-2009, 05:51 PM   #3
Veteran Member
georgweb's Avatar

Join Date: Apr 2008
Location: Berlin, Germany
Photos: Gallery
Posts: 1,381
Hi Wll,

you might revive this thread, https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/44979-mirror-lenses.html.

About the downslide of digital IQ vs. film-IQ, maybe that's got to do with the smaller circle of confusion (0.2 vs. 0.3 AFAIR) on digital APS-C cams. I have found the Tokina 500 to have low resolution in the first place (compared to 'normal' optics) so you will not get away with less than perfect conditions (+1 for Barondla's concern for a bomb proof tripod and head) and less than nearly full crop of the picture file. Then I learned that the Tokina 500 is one of the better mirrors out there. Rollei used it for their line of lenses so it can't be too bad.

Best, Georg (the other)

Last edited by georgweb; 05-30-2009 at 05:57 PM.
05-30-2009, 06:24 PM   #4
Pentaxian
ivoire's Avatar

Join Date: Mar 2007
Location: chicago burbs
Photos: Gallery
Posts: 3,356
I have that lens and it has its quirks. It produces quite good images on my k20d, but technique is important. The dof is very thin and requires careful manual focus, good light and a sturdy tripod (I've never been able to get a decent pic handheld). I have several photos posted here:

Art by Michael Wolf - RedBubble

If you post a few pics with crops and exif data it will make it easier to offer a remedy, but based on your post i suspect its a dof/focus issue (which is common with mirror lenses).


Last edited by ivoire; 05-30-2009 at 06:37 PM.
05-30-2009, 10:15 PM   #5
Site Supporter
ovim's Avatar

Join Date: Sep 2008
Location: Tre, Finland
Photos: Gallery
Posts: 1,227
I've got a 8/500mm Russian 3M-5A mirror lens and It also needs some careful focusing (I've got a chinese split screen on my K100D) and a lot of light, but I've managed take pretty sharp pics hand held with it. This one was kind of a pointless shot but the sharpness is pretty good.



Link to full size here

This lens was highly recommended by the folks on mflenses.com forum but your tokina was also mentioned to be quite good.
05-31-2009, 09:33 AM   #6
wll
Veteran Member




Join Date: Nov 2006
Location: Mission Hills, CA
Posts: 773
Original Poster
This is Much Better

Well I found out what I was doing, user error.

After reading varied post on a few forums, I was hand holding at way to slow a shutter speed. It is a cloudy day here in LA, so I boosted the ISO between 3200 and 4500 to get a good shutter speed and it worked. Also I may have not set the SR to 500mm on previous shots.

Here are a few small shots, I think I found the answer.

Sign was 3200 iso 1/350
Car Rim was 3200 iso 1/250
Basket ball Rim was 4500 iso 1/500

They were cropped and resized to a small image . no Photoshop or anything was done to alter images.

wll






Last edited by wll; 05-31-2009 at 09:44 AM. Reason: I can't spell even with spell checker !
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!
500mm, f8, k-mount, mirror, pentax lens, slr lens, tokina
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Rokinon 500mm f6.3 DX Mirror FotoPete Pentax SLR Lens Discussion 18 01-21-2014 09:35 PM
For Sale - Sold: Tokina 500mm f8 Mirror Lens Stringmike Sold Items 8 02-02-2009 12:11 PM



All times are GMT -7. The time now is 07:26 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