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06-15-2008, 07:18 AM   #1
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Sigma 100-300 f/4 w/ Tamron MC7 TC test pics

I haven't tested too many lenses so I wouldn't take this one to heart but maybe I could get a little advice. I'm not set up at flickr for "pro" so I am limited for space and kept files small. Not sure how to tell if exif is attached. Are these big enough to judge?

Its easy to tell that without the TC pictures are sharper but I think with the TC they are acceptable.

300mm
http://farm4.static.flickr.com/3184/2579859397_88c0b9a50a.jpg?v=0

600mm
http://farm4.static.flickr.com/3176/2580687444_68bee769a1.jpg?v=0

06-15-2008, 08:09 AM   #2
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Hrm, hard to tell.

QUestion - are these 100% crops or downsized full pictures?

If they're downsized, it would be almost impossible to tell the difference. If they're in fact 100% crops, they look pretty good.


If you would like, you could email me the pictures (full size) and I can host them on my pro flicker, and post them inline in this thread. I'm interested in the results myself

Just let me know, and I can PM you my email address. If not, that's fine too
06-15-2008, 08:13 AM   #3
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I would also be interested to see what cputeq suggested!

How did the AF work with 2x TC? (if it did at all?)
06-15-2008, 12:52 PM   #4
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I'm sorry I forgot to add they were just 100% crop. I actualy thought the TC preformed fairly well, but not as well as I was hoping. If that makes any sence.

AF did work. ( not expected ) But hunted like hell with lower light situation. ( expected )

cputeg, I think I'll take you up on that. Is it the PEF file you would like or a converted jpeg or tiff. Just let me know exactly what you did.
I don't think I am doing the crop right anyway. I zoom the photo out to 100% and then try to crop within perimeter. Elements 5. There has got to be an easier way.

06-15-2008, 01:43 PM   #5
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PMed you with information on how to get the pictures to me ! Thanks
06-15-2008, 02:08 PM   #6
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Photos sent.
Thanks, looking forward to the results.
06-15-2008, 04:48 PM   #7
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After wrestling with Flickr Uploadr for 30 minutes here they are! Thanks for letting me do this, this is interesting.

Couple of notes -- Angles on the shots weren't perfect, so I couldn't line them up in Photoshop and take exact crops. That being said, I had to estimate crops and go from there.

Click on the "full" versions and you can see traverse to my flickr to see the full res. shots if you want -- I'm not going to inline them here.

Everything else is 100% crop.

To OrenMC : Flickr: Help: Free Accounts, Upgrading and Gifts that link should answer some question about Flickr. This is their main FAQ page here: Flickr: Help

For unlimited bandwidth, pictures, sets, etc. they're not bad at *all* esp. given the very low price of $24. I'm usually pretty cheap when it comes to this type of purchase, but well worth it.
Their uploader tool is usually pretty good, too, but today it was being a bum (maybe I need to reboot).


-----------------------

No TC Full


TC full


No TC Bottom Left


TC Bottom Left


No TC Foot


TC Foot


No TC eye


TC Eye




Judging by the shots, it's possible the center of focus wasn't the same on the shots, as it wouldn't make sense to have a TC shot be sharper than a non-TC shot (notice the threads in the bag on the bottom left crop, for instance). But, as just casual inspection, I think these shots give a pretty good guestimate of how a TC will affect the quality. I thank the OP for letting us view the pictures

Last edited by cputeq; 06-15-2008 at 04:54 PM.
06-15-2008, 07:07 PM   #8
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Hmmm, pretty good!

06-15-2008, 07:08 PM   #9
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Quote "But, as just casual inspection, I think these shots give a pretty good guestimate of how a TC will affect the quality. "

I quess it will do in a pinch. Looks like I am going to have to spring for the Sigma APO 2x and hope for better results. It's going to be a while before I can save for a long prime. I have the Sigma 1.4x coming this week which should help. I know I need a lot of practice on my technic before things are consistant.

I was out again with it today practicing. We finally have some sun here in Seattle. Looks like its going to stay for a few days also. It was in the news that it was colder here than in Siberia a couple days ago.


Thanks again cputeg.

Last edited by OrenMc; 06-15-2008 at 10:15 PM.
06-15-2008, 07:45 PM   #10
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QuoteQuote:
I was out again with it today practicing. We finally have some sun here in Seattle. Looks like its going to stay for a few days also. It was in the news that it was colder here than in Siberia a couple days ago.
I will trade you weather!!

I'm in Shreveport, LA. I think it was around 90F today with about 85-90% humidity.
And guess what? It's going to be that way until around November

I truly believe this is the worst place I've ever lived (but I'm military, so I'm stuck here!)
06-15-2008, 09:30 PM   #11
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were these taken handheld or using a tripod?
06-15-2008, 10:14 PM   #12
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Tripod.
I was just trying to get a quick look at the IQ with the newused TC I just bought. Not very exact but an idea. Exposure wasn't ideal overall. I think if I wasn't stumbling all over myself it would speak better for itself.
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