Distance Ring on Sigma lenses

AndyBorzi

AndyBorzi

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I have the Sigmas 24-70 and 12-24 both have the distance window set into the barrel along with f-stop markings on the barrel.

I know from primes that to set the focus you put the little L shaped infinity mark against the right hand f-stop number and the distance against the left f-stop marker is the closest in focus distance (hyperfocal? :shrug: )

How does this work for Zoom lenses like the two I have? Are the markings there just for the widest setting?
 
I thought I could help because I have a couple of Sigma 12-24s (Canon and Nikon versions). But it's weird.

There appear to be two different designs of the Sigma 12-24. Figure 1 in the instruction manual makes this quite clear. The Sony / Pentax version has two sets of aperture numbers on the barrel. One refers to the depth of field at f=12mm and the other to the DOF at f=24mm. Pretty sensible, you'd say. But the Canon / Nikon version only has one set!

Close inspection of the instruction manual shows that the set of numbers on the Canon / Nikon version refers to the DOF at f=12mm. Look at figures 4 and 5 in the manual.

Sorry, can't help you with the Sigma 24-70mm.
 
The scales usually use an approximation for zooms anyway and are generally accurate only a one focal length, unless your zoom happens to be par-focal (most aren't)

How are you finding the 12-24 Andy? I'm still after one but too tight to buy a new one :)
 
puddleduck said:
The scales usually use an approximation for zooms anyway and are generally accurate only a one focal length, unless your zoom happens to be par-focal (most aren't)

How are you finding the 12-24 Andy? I'm still after one but too tight to buy a new one :)
Click to expand...

I only got it yesterday so haven't really used it properly but I have tested for general sharpness just in case it suffered from the Sigma 'bad copy' issues. (I have owned 3 Sigmas now and all have been great! :clap: ) . It was a pretty crappy day yesterday, cold, grey and I had my 4 year old daughter with me so didn't manage to get anything good but using the AF rather than hyperfocal it seems pretty sharp. It is very fast & quiet to focus using the HSM.

On first impressions it is a great looking chunky lens. Well built with smooth zoom and focus rings, unlike the 24-70 which has a stiff zoom ring. I'll have to be very careful with it because you cannot protect the 'popeye' element with a filter. It has a built in petal hood and a slip over ring that allows the lens cap to be put on.

Its WIIIIIIIIIIIIIIIIIIIIIDDDDDDDDDDDDDEEEEEEEEEEEEEE - i'm sure you can see behind you! :D

The viewfinder is a little dark (with a smoky brown look :shrug: ) because it has a max ap of f4.5 but I am not bothered about that because it will be my landscape/architecture lens and won't really need it for lowlight.

I'm not sure if I like the rear filter holder, though I don't have any gels yet to try it out. I'm not sure how grads would work in there though! LR2 or ACR 5.2 allow post-processing of grads though.

I had a Canon 10-22 on my 40D and I loved that lens and I can see I will be loving this Sigma 12-24 once I get used to extra wideness of it.

First impressions 8/10.

Ooh this turned into a mini review! :)
 
StewartR said:
I thought I could help because I have a couple of Sigma 12-24s (Canon and Nikon versions). But it's weird.

There appear to be two different designs of the Sigma 12-24. Figure 1 in the instruction manual makes this quite clear. The Sony / Pentax version has two sets of aperture numbers on the barrel. One refers to the depth of field at f=12mm and the other to the DOF at f=24mm. Pretty sensible, you'd say. But the Canon / Nikon version only has one set!

Close inspection of the instruction manual shows that the set of numbers on the Canon / Nikon version refers to the DOF at f=12mm. Look at figures 4 and 5 in the manual.

Sorry, can't help you with the Sigma 24-70mm.
Click to expand...

I didn't look that close to be honest....RTFM Andy! :lol: Thanks for looking though! :)
 
AndyBorzi said:
I only got it yesterday so haven't really used it properly but I have tested for general sharpness just in case it suffered from the Sigma 'bad copy' issues. (I have owned 3 Sigmas now and all have been great! :clap: ) . It was a pretty crappy day yesterday, cold, grey and I had my 4 year old daughter with me so didn't manage to get anything good but using the AF rather than hyperfocal it seems pretty sharp. It is very fast & quiet to focus using the HSM.

On first impressions it is a great looking chunky lens. Well built with smooth zoom and focus rings, unlike the 24-70 which has a stiff zoom ring. I'll have to be very careful with it because you cannot protect the 'popeye' element with a filter. It has a built in petal hood and a slip over ring that allows the lens cap to be put on.

Its WIIIIIIIIIIIIIIIIIIIIIDDDDDDDDDDDDDEEEEEEEEEEEEEE - i'm sure you can see behind you! :D

The viewfinder is a little dark (with a smoky brown look :shrug: ) because it has a max ap of f4.5 but I am not bothered about that because it will be my landscape/architecture lens and won't really need it for lowlight.

I'm not sure if I like the rear filter holder, though I don't have any gels yet to try it out. I'm not sure how grads would work in there though! LR2 or ACR 5.2 allow post-processing of grads though.

I had a Canon 10-22 on my 40D and I loved that lens and I can see I will be loving this Sigma 12-24 once I get used to extra wideness of it.

First impressions 8/10.

Ooh this turned into a mini review! :)
Click to expand...

Nice one - I'm getting twitchy on that Jessops "Add to Cart" thingy..;)

Really appreciate your feedback, Andy :)
 
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