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02-19-2013, 12:39 PM   #1
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300mm F2.8 EX APO DG HSM

Perhaps it has been there for awhile but I noticed that the Sigma 300 2.8 HSM is now available in a Pentax mount. This lens seems to have pretty good reviews. If indeed Pentax introduces a quality 1.4 tele-converter this is a very attractive lens.

Does anyone have experience with this lens?

The 500 is still not available with HSM.

02-19-2013, 12:42 PM   #2
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If you're referring to this one, it's been around for a while and doesn't offer HSM in the Pentax mount as far as I know:
Sigma 300mm F2.8 APO EX DG Lens Reviews - Sigma Lenses - Pentax Lens Review Database

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02-19-2013, 12:45 PM   #3
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QuoteOriginally posted by Adam Quote
If you're referring to this one, it's been around for a while and doesn't offer HSM in the Pentax mount as far as I know:
Sigma 300mm F2.8 APO EX DG Lens Reviews - Sigma Lenses - Pentax Lens Review Database
It is listed on the Sigma site 11 elements vs 9 plus HSM
see 300mm F2.8 EX APO DG HSM - Super Telephoto Lenses - SigmaPhoto.com
02-19-2013, 01:16 PM   #4
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QuoteOriginally posted by RockvilleBob Quote
It is listed on the Sigma site 11 elements vs 9 plus HSM
see 300mm F2.8 EX APO DG HSM - Super Telephoto Lenses - SigmaPhoto.com
On Tech specs, Converter is listed for all mounts but HSM is NOT listed for Sony nor Pentax.

02-19-2013, 01:31 PM   #5
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You are right, I didn't read the fine print and thought Sigma added Pentax to the HSM mount. Looks like both the lenses I have interest in the 300 and 500 are not HSM mounts. It doesn't seem like a technical reason since HSM for Pentax is offered in some of their other lenses including the 30mm 1.4.
02-19-2013, 01:36 PM   #6
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If you have the sigma lens, you might be better off with the sigma converter rather than the pentax converter. However the sigma converter intrudes into the lens and can't be used with most pentax lenses. (risk of damaging lens)
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