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Pentax DA*300mm Viviar X2-22 and Pentax QS1
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PostPosted: Wed Feb 24, 2021 9:25 am    Post subject: Pentax DA*300mm Viviar X2-22 and Pentax QS1 Reply with quote

Hello,

This week i needed to combine a setup so i could Photograph a ( rare ) bird near to me. there was no way to get closer.
(Pentax DA*300mm Viviar X2-22 and Pentax QS1)

I was pleasantly suprised with the sharpness hitting the tiny Q sensor after passing trough the Vivitar 2x-22.

So what do you do? point it at the moon of course Razz

Would the image be better with a higher grade tele converter ?

Thank you!

100% Crop


No Crop. ( actual sensor size )


PostPosted: Wed Feb 24, 2021 12:31 pm    Post subject: Reply with quote

excellent result. Like 1 small
IME the first thing that counts is the quality of the lens. Then the next is how well you stabilise everything. And thirdly (esp for eg moon shots) - atmospherics. I can suggest that the viv tc must be a pretty good one by vintage standards - is it one of the 7 element ones (these are usually either cheaper 4 element ones or better 7 element ones like the viv macro tc).
A more modern one like a kenko AF 2x might well have slightly better optics/better coatings, but whether that would actually show in results is more debatable.


PostPosted: Wed Feb 24, 2021 12:56 pm    Post subject: Re: Pentax DA*300mm Viviar X2-22 and Pentax QS1 Reply with quote

KarelDH wrote:


Would the image be better with a higher grade tele converter ?

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Hardly, since only the central portion of the picture is interested by the the subject IMHO


PostPosted: Wed Feb 24, 2021 1:36 pm    Post subject: Reply with quote

@ Ultrapix

interesting i honestly didn't think about it that way.

because of the small sensor ( of the Q ) it only takes the ( maybe ) better/good part from the projected image.
( i think this is what you mean )

yep this could be a valid point.

Thank you for your insight!


PostPosted: Wed Feb 24, 2021 5:35 pm    Post subject: Reply with quote

KarelDH wrote:
@ Ultrapix

interesting i honestly didn't think about it that way.

because of the small sensor ( of the Q ) it only takes the ( maybe ) better/good part from the projected image.
( i think this is what you mean )

yep this could be a valid point.

Thank you for your insight!


The two things go in the same direction: so, since the major improvement with the 7 lenses converter is about edges, and you cut them twice, I bet that there is little room for improvements, unless you go for a 600 prime of the same quality of your 300


PostPosted: Wed Feb 24, 2021 8:00 pm    Post subject: Reply with quote

How does the 2x image compare to the non-converter image?


PostPosted: Wed Feb 24, 2021 9:02 pm    Post subject: Reply with quote

caspert79 wrote:
How does the 2x image compare to the non-converter image?


The same but smaller Wink. a tad sharper and les ghosting in the light area's



PostPosted: Wed Feb 24, 2021 9:49 pm    Post subject: Reply with quote

by the way, this is one of the best moon shot that I have seen among those took with amateur gear, and it's interesting that it comes from a small sensor coupled to solid glass Wink


PostPosted: Thu Feb 25, 2021 4:00 am    Post subject: Reply with quote

Ultrapix wrote:
by the way, this is one of the best moon shot that I have seen among those took with amateur gear, and it's interesting that it comes from a small sensor coupled to solid glass Wink

Agreed. Moon shots bore me to death, but this one has such degree of detail, almost 3D, that I can't stop looking.


PostPosted: Thu Feb 25, 2021 7:49 pm    Post subject: Reply with quote

invisible and Ultrapix, Thank you for your kind words ^^.

Now I'm curious if adding a extra 2x would give an acceptable result Razz.
I should have a Tamron x2 somewhere, il post the results in the near future