Quote:
Originally Posted by OzEclipse
For around that same price, you can get a Samyang/Rokinon 135mm f2, a fantastic tack sharp wide field astrographic lens. They are sharp wide open but with vignetting.
Add a quality 1.4X converter and you have a 200mm f2.8 and a 2X converter and you have a 270mm f4, not that different to the Redcat. .
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I had a Samyang 135 and sold it to fund an upgrade to a longer focal length scope, being under the impression a telescope would yield better images at 250-400mm. I already have a 70-200 2.8L. To increase focal length I have been comparing a used 100-400 f4.5-5.6L, an f4 300mm, the Zenithstar 61 (F5.6, 360mm) and a refurbished redcat 51 (250mm, f4.9) I am using a full frame canon camera.
On paper, the 70-200 I already have looks like a winner at F2.8. Is the redcat or zenithstar going to yield better results?