Sigma 70-300mm OS for Dynax 7?

[SqueamishOssifrage]

When this lens was announced on the AP site here the slightly strange English indicated that it was APS-C only, so I looked no further. I have now learned that it is full frame and available in Sony Alpha fit. The blurb also states that it will not work in AF/OS mode on Pentax and Sony film (sic) cameras. However, as the Dynax 7 mount is exactly the same as the 7D mount, it could actually be just non-ADI mounts that it will not work with.

If anyone can shed any light on this possibility, I would be extremely pleased to hear it, so I can relay the information to Santa in good time.

[Roger_Provins]

I'd recommend posing the question on the Dyxum forum.

Then if you get a definitive answer come back here and let us know

[SqueamishOssifrage]

Hmmm ...

I once posted a question on the Dyxum forum asking if someone could let me know what the reported maximum aperture(s) were on the Sigma 75-200mm/f2.8-3.5 between 140mm and 200mm (late serial number). I did not receive a single reply, I had to modify the AF circuit board several times before I got it to work on my 7. For some reason the lens would not AF between 140 and 190mm, and had I known the aperture details in full, I could have calculated the required mods, and done the job just once.

I suppose I could venture on there again ...

[swanseadave]

Is this the one?
If so click on the link to the Sigma site.
It is a D lens so ADI will work.

Cheers

[SqueamishOssifrage]

Thanks for the link to a link!

Yes, thats the lens - but if you go here then it says this:-

For Pentax and Sony mount, it is not possible to use AF and OS when attaching to a film SLR, Pentax ist* series and K100D DSLR cameras.

Hence my quandary. If I lived in the UK I would just pop along to somewhere that had one, and try it out. Over here - no chance.

[swanseadave]

Thanks for the link to a link!

Yes, thats the lens - but if you go here then it says this:-

For Pentax and Sony mount, it is not possible to use AF and OS when attaching to a film SLR, Pentax ist* series and K100D DSLR cameras.

Hence my quandary. If I lived in the UK I would just pop along to somewhere that had one, and try it out. Over here - no chance.

I understand your problem now.Not looking very good if you want to use it on a Dynax.I could call into Jessops with my Dynax 40 to check for you but the chances of them having one in stock is remote!I will ask though.

Cheers

[swanseadave]

Just an update.Called into local Jessops this morning and guess what..........
now they no longer stock Sigma!!It`s not long ago they dropped Pentax so what next?
Probably easier to list what they DO stock--Canon,Sony and Tamron.That`s all I could see in the display cases.

Cheers

[SqueamishOssifrage]

Well, thanks for trying. It's pretty unbelievable that a nationwide camera shop should stop selling the largest independent lens manufacturer's products!

[swanseadave]

Forgot to say
The local independent camera shop DOES stock Sigma. They do have that lens in stock but not yet in KM/Sony mount.
So watch this space,I`ll check next week for you.
Cheers and glad to help

[SqueamishOssifrage]

Very many thanks - it's much appreciated. I shall, as you say, watch this space!

[swanseadave]

There,I haven`t forgotten!
Unfortunately the shop still hasn`t received the lens and no idea when(or if) it will arrive.
Sorry I can`t be more helpful but I will check FTTT.
I don`t know if it`s significant,but the Sigma website no longer has the bit about not working with film cameras. see here

Cheers

[SqueamishOssifrage]

Very many thanks for following up on this for me - it is much appreciated. You flagged the US Sigma site (http://www.sigmaphoto.com/lenses/len...63&navigator=3), but unfortunately the UK site (http://www.sigma-imaging-uk.com/lens...70-300mmOS.htm) is still showing the caveat.

There is definitely something weird about Sigma and Dynax. I ended up with two Sigma 75-210mm f2.8/3.5 from eBay.de, and had to modify the circuit board on one of them to get it to work properly on my Dynax 7. However, now I have a Dynax 5 as well, I tried the unmodified lens on it - and it works perfectly.

[swanseadave]

Now that is weird.I will keep checking for you.

BTW,that Sigma link came via Dyxum.
Cheers