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.