Sounds like a compatibility issue with the TC to me.

John

Hi Sue, I won'i be much help here sorry. I don't own the Tamron 70-200 f/2.8 but have 4 TC's, 2 of them are Teleplus SHQ models 1.5x and 1.7x and work well with DA*200 and DA*300 SDM lenses although they tend to hunt a little depending on conditions. I have a Teleplus 2x MC7 (not DG) this will not work with SDM lemses but works fine with normal screw drive AF lenses, I'm surprised yours works with Sigma HSM, both the SHQ converters also work fine with conventional AF. The only thing I can suggest is cleaning the contacts on the back of your Tamron lens mount to see if that may be causing the problem. The Tamron 90mm f/2.8 Di Macro I have works fine with all the converters I own.

John

I'm not so sure, Nikon only recently went to 16Mp with the D7000 AFAIK in APS-C, they sold D300's in droves based on the image quality of 12.3Mp amongst other attributes. Personally 16Mp would suit me fine, now just concentrate on low noise, better AF, better metering etc. Leave out the gimmicks................and get the QC sorted

John

Lovely and sharp, beautiful colour.

John

That's good to know, do you know what aperture was used? It is a very similar formula to the FA-35/2 - 6 elements in 5 groups:

http://www.bdimitrov.de/kmp/lenses/primes/_optics/35f2.4.gif

http://www.bdimitrov.de/kmp/lenses/primes/_optics/35f2-iii.gif

John

John

When/if that happens I'll not buy that camera, but I would assume that Pentax would have the good sense not to go there:

Some interesting comments on the 18Mp Canon 7D here:

http://www.photozone.de/dslr_reviews/478_canon_eos_7d?start=2

John

At 16Mp the censor is no longer the limit of resolution, it's the lens you have on the front of the camera. Even the FA 43 Ltd would struggle to outresolve the censor at it's optimum aperture. I found myself only buying primes after upgrading from K10D to K20D.

John

It's for use with program modes on Ricoh cameras such as the Ricoh XRX.

See:

http://www.butkus.org/chinon/ricoh.htm

http://forums.steves-digicams.com/pentax-samsung-dslr/64881-one-last-word-ricoh-...

John

Works perfectly with 49mm clip-on cap thanks.

John