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Comment by topcaps posted on Tokina Extension Tubes at 24/07/2009 - 15:26
Which part of the uk are you in. If its close enough then I will probably be interested
Chris
Comment by topcaps posted on Tokina Extension Tubes at 24/07/2009 - 15:16
Thanks for the explanation Chris. I'm showing my beginner status here...
While I was originally thinking I could increase the focal length of my lenses, being able to focus closer may also be useful. I read through the info from the link you provided and it seems there are a few question marks over their compatibility with lenses.
Do you have any experience of using these on a DA*16-50 or 50-135?
To increase the focal length of a lens you need a tele-converter, Pentax don't produce one currently but talked about introducing one a while ago - they had it on their lens roadmap but was taken off.
Don't have either of these lens but my understanding is that you need to have an apiture ring on the lens to use them as there are no electrical contacts on these extension tubes. Therefore i do not believe they are compatable with the current DA range of lenses
I only used these a couple of times on a FA50 F1.4 and an old 200mm F3.5 manual lens i picked up for about £10 on ebay, this worked well because both lens have an apperture rings and the 200mm lens had a long travel focus ring helping to get the focus easier.
Comment by topcaps posted on Tokina Extension Tubes at 24/07/2009 - 14:19
hi topcaps
Can you give me some more info please?
Are they K-mount or thread mount? By how much will these increase the focal length of a lens - for example the DA*50-135?
Thanks.
Martin
These are K mount.
Also extension tubes do not change the focal length of the lens or the optical quality as they have no lens elements. They allow the lens to focus closer than it's design, but as a trade off you can not focus to infinity.
For more info on extension tubes have a look at this link
http://www.alanwood.net/photography/extension-tubes.html
Regards
Chris
Comment by topcaps posted on Tokina Extension Tubes at 24/07/2009 - 09:16
Regards
Chris
Comment by topcaps posted on Tokina Extension Tubes at 22/07/2009 - 13:51
These extension tubes do not auto focus or have electrical contacts, picture of the mount as follows

Regards
Chris
Comment by topcaps posted on Tokina Extension Tubes at 19/07/2009 - 23:08
For sale set of 3 Tokin Extension tubes, £25 delivery included to the UK, overseas at cost above UK shipping.

Regards
Chris
Comment by topcaps posted on Tokina Extension Tubes at 18/07/2009 - 23:28


Thanks for the reply and even more info, especially as you've done yourself out of a sale. I understand what you're saying r.e. lack of aperture ring, you're right - they won't be any good with either lens...
R.e. my kit - yes, nice to learn on - too nice really. I'd not intended upgrading from the kit lens until I had more experience but recent price rises spurred me to make the lens purchases a year or so early.
Thanks again.
Think pentax sold a lot of kit before the price rises, i got a DA* 60-250mm recently which i am really enjoying
Regards
Chris