what causes the poor quality

Started 1 month ago | Questions thread
Alan WF
Alan WF Senior Member • Posts: 1,839
Re: what causes the poor quality

ocean76 wrote:

Sjak wrote:

An additional issue is that you're shooting wide open, since there is no aperture control.

Lenses typically are softer wide open.

the lens is f4 originally and shooting at f8 should still be sharp, so I really think that my adapter is wrong. But when I think again, how can an adapter without a glass can be the reason for these muddy and soft results? Does it make sense?

In both images with the Canon lens, the lens is at f/4. However, with the teleconverter, you are then taking that f/4 image and optically magnifying it by a factor of two. That process is likely to take the already somewhat soft image and make it softer.

I also worry whether either of the images with the Canon is adequately focused. How did you focus?

Regards,

Alan

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