Digital Concepts 2x teleconverter test

madbrain · 08-04-2008, 12:48 AM

These shots were all taken on my K200D at 1/180 with built-in flash. Distance was about 4 ft.
The lens was a Tamron 28-300 XR LD macro, without any filter.
The subject is the front of my Schimmel grand piano, lit by many fluorescent bulbs.

I had to use manual focus for many of the shots with the TC. Despite my best efforts, I didn't always get it right. I know it's possible to do better since my shot at 600mm is sharper some of the other ones at lower focal length.

Photos are here :
Digital Concepts 2x teleconverter test on Share on Ovi

Things I learned :

1) manual focus is really hard ! Especially at short distance with long focal length.

2) there is a magenta cast in the 53mm + TC shot . It doesn't appear in the other shots. Odd.

3) my piano needs a cleaning

4) definite loss of light with the TC . But the 600mm shot doesn't look too bad to me.

I hope there will be a moon to photograph soon.

drabina · 08-04-2008, 06:53 AM

Where did you get the teleconverter and how much was it? If you do not mind me asking. Is it autofocus?

Thanks.

madbrain · 08-04-2008, 02:13 PM

Originally posted by drabina

Where did you get the teleconverter and how much was it? If you do not mind me asking. Is it autofocus?

Thanks.

Ebay (vcc113). $64.95 .

Yes it is autofocus, but at the highest focal lengths I had to manual focus because the autofocus didn't seem to work quite right (focused wrong).

The specs say it's autofocus up to f4.0.

drabina · 08-04-2008, 05:46 PM

Thanks madbrain.

madbrain · 08-11-2008, 04:09 PM

I finally had clear skies last week. I wasn't able to get any sharp shot of the moon with my Tamron 28-300 at 300. I tried the TC with all my lenses in other lighting conditions and at various focal lengths. I didn't get any really sharp shots with AF either. So, I decided to return it to the seller.

08-04-2008, 12:48 AM	#1
madbrain Veteran Member Join Date: May 2008 Location: San Jose, CA Posts: 1,341	Digital Concepts 2x teleconverter test These shots were all taken on my K200D at 1/180 with built-in flash. Distance was about 4 ft. The lens was a Tamron 28-300 XR LD macro, without any filter. The subject is the front of my Schimmel grand piano, lit by many fluorescent bulbs. I had to use manual focus for many of the shots with the TC. Despite my best efforts, I didn't always get it right. I know it's possible to do better since my shot at 600mm is sharper some of the other ones at lower focal length. Photos are here : Digital Concepts 2x teleconverter test on Share on Ovi Things I learned : 1) manual focus is really hard ! Especially at short distance with long focal length. 2) there is a magenta cast in the 53mm + TC shot . It doesn't appear in the other shots. Odd. 3) my piano needs a cleaning 4) definite loss of light with the TC . But the 600mm shot doesn't look too bad to me. I hope there will be a moon to photograph soon.

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08-04-2008, 06:53 AM	#2
drabina Veteran Member Join Date: Feb 2008 Location: NJ Posts: 525	Where did you get the teleconverter and how much was it? If you do not mind me asking. Is it autofocus? Thanks.

08-04-2008, 02:13 PM	#3
madbrain Veteran Member Join Date: May 2008 Location: San Jose, CA Posts: 1,341 Original Poster	Originally posted by drabina Where did you get the teleconverter and how much was it? If you do not mind me asking. Is it autofocus? Thanks. Ebay (vcc113). $64.95 . Yes it is autofocus, but at the highest focal lengths I had to manual focus because the autofocus didn't seem to work quite right (focused wrong). The specs say it's autofocus up to f4.0.

08-04-2008, 05:46 PM	#4
drabina Veteran Member Join Date: Feb 2008 Location: NJ Posts: 525	Thanks madbrain.

08-11-2008, 04:09 PM	#5
madbrain Veteran Member Join Date: May 2008 Location: San Jose, CA Posts: 1,341 Original Poster	I finally had clear skies last week. I wasn't able to get any sharp shot of the moon with my Tamron 28-300 at 300. I tried the TC with all my lenses in other lighting conditions and at various focal lengths. I didn't get any really sharp shots with AF either. So, I decided to return it to the seller.