K100D and old Tokina lenses.

Hi everyone, how you doing?

 

I need a bit of advice. My work is thinking about buying the K100D (they don't

want to spend Canon or Nikon money) and plus they have a series of old Tokina

lenses which they have uncovered from somewhere.

 

I am wondering the compatibility of these lenses with this K100D, they seem like

they are good pieces of glass (though I haven't tried them yet) -though being a

Canon boy, I thought it would be better off to ask someone with some Pentax &

Tokina experience.

 

The 2 lenses are:

Tokina AT-x pro 28-70mm 2.8

Tokina AT-x Pro 20-35mm 2.8 F&R Aspherical

 

Both pieces have a manual aperture rings and I am wondering how these are used

with the K100D. And also whether there are issues with the lens fitting the

body (like old sigmas on canon digitals hitting the mirror etc).

 

Thank you!

 

Chris

If your work decides to go elswhere I will gladly buy the 20-35mm.

<p>

I'm not joking either gladly buy it (does this tell you it's a decent lens).

<p>

Oh yeah, since I already had the 28-70 and the 80-200 I guess you can say I find tokina ATX-Pro glass to be among the best glass made both optically and mechanically.

<p>

The only issue I've had with the 28-70 is the fact that in stadium lights when shooting right at the lights I've seen ghosting.

<p>

Granted, you shouldn't shoot at the lights with any lens but it's not always avoidable. However, even when shooting into the sun with that lens, I've never seen flare or ghosting. Just those stadium lights every now and then.

<BR>

<a href="http://feeds.feedburner.com/%7Er/MountainVisions/%7E6/1"><img

src="http://feeds.feedburner.com/MountainVisions.1.gif"

alt="Mountain Visions: The Wilderness Through My Eyes"

style="border: 0pt none ;"></a>

Chris: Assuming that these lenses are indeed K-mount and have the 'A' position on the aperture ring, there's nothing special you need to do--just leave them on 'A' and control aperture through the on-body controls. I haven't heard yet of compatibility issues with Tokina K-mount glass. There may be some "KR" (k-mount for Ricoh) glass out there that can get stuck on the body. If the lenses do not have the 'A' on the aperture ring, you need to use 'M'anual shooting mode and perform stop-down metering to set the proper exposure. This has been covered before, but the short version:

 

1. Enable aperture ring in custom settings and switch to 'M' mode

2. Set the aperture ring as desired

3. Press AE-L button; the aperture will be briefly stopped down and camera will meter and set the exposure automatically to 'program line'

4. Adjust exposure as desired before firing the shutter.

 

The optical depth-of-field preview will also stop down the lens and you can use this for manual metering as well but this won't change the shutter speed for you.

I agree with Justin and Andrew I love my Tokina Lenses. I have the ATX 50 to 250mm and the AF193. I bought the 50/250 in the eighties and shoot it in Manual as Andrew explains and the AF193 is fully compatible and IMHO one of the best at it's price point of around $100.00 new.

I bought a Tokina 28mm with a PK/A/R (Pentax and Ricoh) mount that won't fit on my K100D. I believe those with the Pentax only designation would work OK, and I will try those versions in the future.

A Tokina AT-X 80-200 selling today on eBay, item 170139156450

Hi Bob,

 

The Ricoh lenses will fit on a Pentax, you just have to remove a pin from the mount - compare it to a real pentax K mount lens and you will know what I mean.

 

However, without the pin, it will then not be able to meter properly, so it must either be used wide open with aperture priority, or else in M mode with a manually set aperture.

 

I have a 28/2.8 Ricoh mount lens which I am using on my 10D, but I then to use that wide open most of the time.