Wollensak Apochromatic Raptar 21.25inch and Pentacon 2x TC

[iangreenhalgh1]

After my disappointing results from my first attempt at birding with my Hoya/Tokina 400mm I decided to get out the heavy artillery.

The FL of the Raptar with 2x TC is 1082mm, the Raptar is f10 and I shot it wide open, with the TC on the back cutting down the light transmittance I had to bump the ISO to 800 on my NEX-3 to get a reasonable shutter speed of 1/250. I still had some issues with camera shake, I need to do some work on the setup to remove the wobble I think.

Results are okay, I don't think the TC ruined the sharpness too much, but next time I will shoot the Raptar without the TC as I have had sharper results from it before without a TC.


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[skida]

Some good'ns there, Ian, but what caused the strange colour on No. 7?

[luisalegria]

Pretty darn good results there given the equipment.

Really long tele is difficult.

600mm is too much for me, and you managed 1000mm+
And I have IS.

[iangreenhalgh1]

I'm not sure about #7, I'm guessing it's just atmospheric conditions. PP was just auto contrast in Photoshop then sharpening.

Cheers Luis, these are just the decent ones from a large number of shots. I reckon if I fix the wobbly T-mount fitting and sort out the askew M42-NEX adapter (it needs the set screws loosening and a tweak of about 15 degrees) I can get better results, as it is, this is a bit of a wobbly setup.

This telephoto shooting really isn't my thing, but I like trying different things from time to time.

Here's an old picture of the contraption, with my old tripod, I've got a much sturdier Velbon now:

[Attila]