manzoori
Posts: 1459
Joined: Sun Sep 22, 2002 7:08 am

D30 & Sigma 170-500 Focusing Issue

Wed Apr 14, 2004 2:28 pm

As mentioned in this post I finally got the opportunity to give the D30/Sigma combination it's first proper outing of the year at Manchester.

Overall I'm very pleased with the results I've been able to obtain but one (dare I say it) 'flaw' with this setup is a failure to focus at the short end of the lens. As an aircraft began it's take-off roll I would be zoomed out to 500mm gradually pulling back all the way to 170 as it passed side on to me and the push out to 500mm as it climbed out. However I began to notice that as I zoomed in to anything less than 250mm the lens would simply refuse to focus on the aircraft.

I then tried this by focusing on static objects and still the same problem. The camera is exhibitng no error messages and focuses fine throughout the range with my 28-80 & 75-300.

Anyone else experienced this and have a solution? Have I been a complete dufus and missed something blindingly obvious?  Confused  Confused

I'm wondering if this could be a low power issue? I only ask this as I've just tried the camera again focusing out of my window and it now focuses throughout the zoom range!  Angry

Yesterday was a beautiful day with great sun but my battery pack was a bit low on juice. Today with fully charged battery pack and pretty grey and overcast conditions it focuses very nicely thanks!  Confused

Cheers!
Rez
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Sukhoi
Posts: 1561
Joined: Thu Jun 01, 2006 3:03 am

RE: D30 & Sigma 170-500 Focusing Issue

Wed Apr 14, 2004 3:43 pm

I remember when I had a 170-500 on my Fuji S1 if the battery power got low then it wouldnt focus all that well so it may be a power issue?

Cheers

Paul
 
Granite
Posts: 5026
Joined: Tue May 18, 1999 5:55 pm

RE: D30 & Sigma 170-500 Focusing Issue

Wed Apr 14, 2004 4:00 pm

Hi Rez

That could be the problem........but for all the time I have had the D30 and the Sigma.....not one problem with it at all. Maybe I am just lucky.

I do have some crap shots with the lens but user error as opposed to lens/camera error  Wink/being sarcastic

Cheers

Gary
 
manzoori
Posts: 1459
Joined: Sun Sep 22, 2002 7:08 am

RE: D30 & Sigma 170-500 Focusing Issue

Wed Apr 14, 2004 4:52 pm

Paul / Gary,

Thanks very much for the feedback guys! I think your right... as I was writing the OP I suddenly thought I'd better try it again to be sure I had my facts straight and lo & behold it focuses fine... with the freshly charged batteries!

Live & learn eh! Methinks I'll get a couple more batteries for the airshow weekends coming up to make sure that doesn't happen again!

Cheers!

Rez
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EGBB
Posts: 527
Joined: Wed Feb 16, 2000 3:21 am

RE: D30 & Sigma 170-500 Focusing Issue

Wed Apr 14, 2004 5:09 pm

I know Gary loves this lens and indeed has achieved some superb shots from it but I had this lens for 2 days some 18 months ago and found the AF impossible with it not able to lock on any moving subject

Derek
 
Joge
Posts: 1386
Joined: Tue Feb 22, 2000 3:26 am

RE: D30 & Sigma 170-500 Focusing Issue

Wed Apr 14, 2004 5:44 pm

the AF impossible with it not able to lock on any moving subject

The next shouldn't be a reason for the problem on the short end, but what about the f:6,3 at 500mm? I thought most of the Canon SLRs stop the AF at 5,6.

-Joge
Bula!
 
manzoori
Posts: 1459
Joined: Sun Sep 22, 2002 7:08 am

RE: D30 & Sigma 170-500 Focusing Issue

Wed Apr 14, 2004 5:50 pm

Hi Derek,

It definitely does lock... and did quite happily yesterday at the long end of the zoom. I've trialled the combo at EMA prior to the MAN trip and it worked fine there too... at all lengths of the zoom.

There's no denying, it's no L glass but in terms of 'bang for the buck' it takes some beating

Cheers!

Rez
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rotor1
Posts: 222
Joined: Tue Mar 18, 2003 8:57 am

RE: D30 & Sigma 170-500 Focusing Issue

Wed Apr 14, 2004 7:29 pm

When I used a 170-500 on a D60, I found that AI Servo focus was a disaster... the lens would not lock on an aircraft for any significant period of time. It'd get it right, then hunt a bit, then right, then hunt, and so on and so forth. Lots of blurry (out of focus shots) on that card... since then, I've used that combo on one-shot focus.

I tried the lens on a 10D briefly, and AI servo was a dream. No hunting like on the D60. Never had a problem focusing with a film rebel.

Maybe it depends on the camera?

-Mike
The best aviation photo I've ever taken was rejected by Airliners.net
 
airhead711
Posts: 243
Joined: Thu Mar 28, 2002 7:38 am

RE: D30 & Sigma 170-500 Focusing Issue

Thu Apr 15, 2004 9:41 am

I also use the 170-500 with the D60.I agree with Mike in that the AI servo focus was absolutely terrible.Exactly as he stated it would lock for a half second and then hunt for 3 seconds.Maybe it was user error but i'll stick to single shot for now.As far as the AF on the single shot focus, i've never had a problem.

Scott
 
Granite
Posts: 5026
Joined: Tue May 18, 1999 5:55 pm

RE: D30 & Sigma 170-500 Focusing Issue

Thu Apr 15, 2004 4:38 pm

Hi all

I always use one shot focus with my D30/Sigma combo.

I never use the AI servo focus at all.

Cheers

Gary Watt
 
manzoori
Posts: 1459
Joined: Sun Sep 22, 2002 7:08 am

RE: D30 & Sigma 170-500 Focusing Issue

Thu Apr 15, 2004 4:59 pm

Yep... found that as well at MAN.... AI focus would catch for a brief second and then hunt for a few seconds missing many a photo opportunity.

We live and learn eh!

Cheers!

Rez
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Dehowie
Posts: 1068
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RE: D30 & Sigma 170-500 Focusing Issue

Thu Apr 15, 2004 8:58 pm

G'day
I found my best results with the 50-500 on my 10D where in single shot AF and only using the centre point for focusing.
I found it hunted a little if using all the focus points.
Dazz
2EOS1DX,EF14.2.8LII,17TS,85/1.2,16-35L,24-70LII,24L,70-200F2.8LII,100-400,300/400/500/800L
 
manzoori
Posts: 1459
Joined: Sun Sep 22, 2002 7:08 am

RE: D30 & Sigma 170-500 Focusing Issue

Thu Apr 15, 2004 9:44 pm

Thanks for the Tip Darren! I've toyed with single point and triple point on the D30... not noticed much of a change but I suppose if we generally aim with the middle of the lens then might as well focus with it.

That said, I read some other post on this very subject and it was suggested that using all three would be beneficial in terms of keeping the whole fuselage in focus for 3/4 frontal shot. Didn't quite catch how that was supposed to work really... it's not like the lens is going to be able to vary it's focus from side to side?

Cheers!

Rez
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Granite
Posts: 5026
Joined: Tue May 18, 1999 5:55 pm

RE: D30 & Sigma 170-500 Focusing Issue

Thu Apr 15, 2004 9:58 pm

Hi all

Sigma 170-500, three point single focus, Canon D30:

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Photo © Gary Watt - AirTeamImages



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Cheers

Gary Watt

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