HSM lens

fernface

fernface

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Brian
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Hi,

Basically my head hurts from technical terms:bang: As a complete beginner i have been researcing whether a 1.4 teleconverter would improve my chances of getting decent shots of birds in the garden. I have come up against "prime" which i know understand, also "HSM lens".

Have googled and searched forums but no luck. Could someone help and old man out and tell me what a HSM lens is please. So many abbreviations bandied about, pity there was not a glossary of terms!:)

Thanks in advance.

Brian
 
Blimey that was quick!!!, so possibly when the specs for the converter says it will work with HSM lens, they mean a lens that has motor built in?
 
lukewoodford said:
Something silent motor
Click to expand...

nope - hyper sonic motor

"HSM stands for "Hyper Sonic Motor". The HSM motor is driven by ultrasonic waves and it makes auto focusing, precise, silent and high-speed. Sigma's HSM version lenses are available only for AF Sigma, Canon and Nikon AF cameras."
 
HSM is to be found on sigma lenses ..

HyperSonicMotor

as in the lens has a focus motor in it
 
Few terms to help you out

Prime Lens = a lens with a fixed focal length (eg. 50mm) means u can't zoom in and out.

Zoom Lens = a lens without a fixed focal length (eg 18-55mm) means u can zoom in and out :)

USM = Ultrasonic Motor (silent and fast focusing)

L Glass = Canon's Professional Lenses, which have a special coating on the front element to reduce lens flare, pin sharp and very fast (eg. Canon 70-200mm L F2.8)

HSM = I assume is Sigma's version of USM, a silent and fast motor for focussing quickly. (Hyper Sonic Motor)

F-number = How wide the apperture opens. (eg. F2.8 is wider than F5.6) meaning it will allow more light into the camera giving you higher shutter speeds.

Shutter Speed = The speed in which the mirror inside the camera takes the photo, the faster the shutter speed the quicker it takes the photo (reducing blur and movement) and vice versa.

Teleconvertors = A 1.4x TC will slow your lens down by 1 stop.
A 2x TC will slow your lens down by 2 stops.

Stops = Same as the F numbers (above) 1 stop is worked out by a square root of 2.
Most common stops = F1 -> F1.4 -> F2 -> F2.8 -> F4 -> F5.6.

Hope that helps you out :lol:
Cheers
Jamie
 
Uneducated_Rick said:
nope - hyper sonic motor

"HSM stands for "Hyper Sonic Motor". The HSM motor is driven by ultrasonic waves and it makes auto focusing, precise, silent and high-speed. Sigma's HSM version lenses are available only for AF Sigma, Canon and Nikon AF cameras."
Click to expand...

lol sorry
 
Thank guys. That clears it up for me. Learn something new every day. I sometimes think i should have stuck to carp fishing as a hobby:)

thanks again Brian
 
As an after thought could i ask for opinions as to whether this would work.
Sorry but i have a million questions. I was thinking of buying

Kenko Teleplus DG 1.4X Pro 300 Teleconverter - Nikon Mount, for my D60, the lens i would like to use with it would be sigma 70-300mm F4-5.6 APO DG MACRO.

Your view very much appreciated as to whether this would be ok.

regards Brian:)
 
I'm not sure on Nikon.
But I'm almost certain that it will only work with MANUAL focussing.
The auto-focus function wont work, as with the lens being F4-5.6, having the 1.4x TC on the lens will make it a F5.6-6.3 And D-SLR's can't auto-focus with this much apperture.

May be wrong however, but I know this is the case on the Canon range.
The only camera which can handle it is the Canon 1d, so I assume it would only be the Nikon D3x that would handle it.
 
i think L actually stands for a special coating on the glass elements of canons top end glass in truth, which tends to be the professional lenses as it is expensive;)
 
fletch5 - I knew it had a special coating on, just couldn't remember at the time of posting :lol:
I'll go edit it quickly :p
 
fernface said:
Have googled and searched forums but no luck. Could someone help and old man out and tell me what a HSM lens is please.
Click to expand...

You didn't google far! I put "HSM lens" into google and the explanation is in the abstract for the 4th entry down (the amazon link).

Google IS your friend.

That's an emphasised "is" and not IS as in Image Stabilisation on Canon Lenses :-)

Glad you got the answer you needed :thumbs:
 
it's alive said:
You didn't google far! I put "HSM lens" into google and the explanation is in the abstract for the 4th entry down (the amazon link).

Google IS your friend.

That's an emphasised "is" and not IS as in Image Stabilisation on Canon Lenses :-)

Glad you got the answer you needed :thumbs:
Click to expand...


Or "VR" on the Nikon:thumbs:
 
Uneducated_Rick said:
nope - hyper sonic motor

"HSM stands for "Hyper Sonic Motor". The HSM motor is driven by ultrasonic waves and it makes auto focusing, precise, silent and high-speed. Sigma's HSM version lenses are available only for AF Sigma, Canon and Nikon AF cameras."
Click to expand...

The HSM mark II's are available on a K mount for pentax/samsing cameras too.
 
J4MIE_P said:
I'm not sure on Nikon.
But I'm almost certain that it will only work with MANUAL focussing.
The auto-focus function wont work, as with the lens being F4-5.6, having the 1.4x TC on the lens will make it a F5.6-6.3 And D-SLR's can't auto-focus with this much apperture.

May be wrong however, but I know this is the case on the Canon range.
The only camera which can handle it is the Canon 1d, so I assume it would only be the Nikon D3x that would handle it.
Click to expand...


I dont think loss of auto-focus will be too much of an issue for me Jamie, as stated in first post its birds in the garden i am after, so would be using tripod and manual focus would be ok - i think!
 
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