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Svbony SV41Pro Mak, opinions? (2 Viewers)
- Thread starter Granpoli
- Start date
These small Maksutov Cassegrain scopes vary enormously in quality from one sample to another.
This seems to be an 80mm.
It also depends how large the secondary spot is.
It should be 25% for good results.
You could get lucky and get a good one or it could be poor or rubbish.
My Konus about 70mm is the worst I have seen. It is an awful plastic piece of rubbish.
The Celestron 70mm is poor.
The Astele 65mm or 70mm is very good.
The Mirador 30x-120x 70mm is really excellent. It also takes 1.25 inch eyepieces.
The 30x60mm Zeiss is very good but limited to 30x.
My 90mm Skywatcher is excellent.
The 90mm BAS is rather poor.
The 89mm Questar is quite good.
In addition the real size is often less than stated as the primary mirrors need to be oversize.
So basically if you are buying unseen and don't know how to test them, there is no answer to your question.
Regards,
B.
This seems to be an 80mm.
It also depends how large the secondary spot is.
It should be 25% for good results.
You could get lucky and get a good one or it could be poor or rubbish.
My Konus about 70mm is the worst I have seen. It is an awful plastic piece of rubbish.
The Celestron 70mm is poor.
The Astele 65mm or 70mm is very good.
The Mirador 30x-120x 70mm is really excellent. It also takes 1.25 inch eyepieces.
The 30x60mm Zeiss is very good but limited to 30x.
My 90mm Skywatcher is excellent.
The 90mm BAS is rather poor.
The 89mm Questar is quite good.
In addition the real size is often less than stated as the primary mirrors need to be oversize.
So basically if you are buying unseen and don't know how to test them, there is no answer to your question.
Regards,
B.
The actual specs listed are 28x-84x80.
The 3x zoom eyepiece is probably 7-21mm or 8-24mm.
This suggests a focal length of 590mm or 670mm.
Assuming the real aperture is 75mm or 76mm this means it is f/8 or f/9.
This is fast for a simple Maksutov with a secondary spot on the front corrector plate.
It may mean that there is light spill at the sides affecting contrast at some magnifications and also not ideal for image quality.
But the only way to know is to actually test samples.
The corrector spot looks reasonably small, maybe 28% to 30%, but the photos aren't clear.
Good Maksutovs have primaries of about f/2.5 and a focal ratio of f/15.
Some like the common 127mm are about f/13.
Mirror camera lenses go from f/4, f/4.5, f/5, f/5.6, f/8, f/10 and f/15.
But they are more complex than simple Maksutov Cassegrains.
Some can be very good, especially some f/8 examples.
Regards,
B.
The 3x zoom eyepiece is probably 7-21mm or 8-24mm.
This suggests a focal length of 590mm or 670mm.
Assuming the real aperture is 75mm or 76mm this means it is f/8 or f/9.
This is fast for a simple Maksutov with a secondary spot on the front corrector plate.
It may mean that there is light spill at the sides affecting contrast at some magnifications and also not ideal for image quality.
But the only way to know is to actually test samples.
The corrector spot looks reasonably small, maybe 28% to 30%, but the photos aren't clear.
Good Maksutovs have primaries of about f/2.5 and a focal ratio of f/15.
Some like the common 127mm are about f/13.
Mirror camera lenses go from f/4, f/4.5, f/5, f/5.6, f/8, f/10 and f/15.
But they are more complex than simple Maksutov Cassegrains.
Some can be very good, especially some f/8 examples.
Regards,
B.
Hello,
I was able to try one of them, and apart from the very narrow field of view, the image presents a vertical bluish line almost in the middle even with low mag. I also appreciate a certain veil in the image..., I did not find this image acceptable.
Otherwise, low weight, very manageable, and smooth focus wheels, also in zoom, all with a plastic feel.
Would I have gotten the lemon?
I was able to try one of them, and apart from the very narrow field of view, the image presents a vertical bluish line almost in the middle even with low mag. I also appreciate a certain veil in the image..., I did not find this image acceptable.
Otherwise, low weight, very manageable, and smooth focus wheels, also in zoom, all with a plastic feel.
Would I have gotten the lemon?
The line is probably from a low cost prism.
I think you got an average sample.
Unless the optical construction has more elements than I think, then this is what one expects from a low cost too fast Maksutov Cassegrain.
An old Opticron 70mm ED spotting scope or a Nikon Fieldmaster? 65 or 70mm if these exist will be better.
A Williams 66mm ED refractor or Televue 60mm or 70mm will be better. Probably very much better.
One needs to try a minimum of three and better six of these 80mm Svbony Maksutovs to know what the average, better and worse samples are.
Your description is what I expected.
There is a better 80mm Maksutov sold by Optical Vision Ltd. The eyepiece was particularly praised.
But I don't know if it is currently available.
Generally, good Maksutovs are best at higher magnifications because they are slow long focal length scopes.
They are not good at low magnifications.
My Skywatcher 90mm is particularly good.
But a high end astro refractor will be better.
Regards,
B.
I think you got an average sample.
Unless the optical construction has more elements than I think, then this is what one expects from a low cost too fast Maksutov Cassegrain.
An old Opticron 70mm ED spotting scope or a Nikon Fieldmaster? 65 or 70mm if these exist will be better.
A Williams 66mm ED refractor or Televue 60mm or 70mm will be better. Probably very much better.
One needs to try a minimum of three and better six of these 80mm Svbony Maksutovs to know what the average, better and worse samples are.
Your description is what I expected.
There is a better 80mm Maksutov sold by Optical Vision Ltd. The eyepiece was particularly praised.
But I don't know if it is currently available.
Generally, good Maksutovs are best at higher magnifications because they are slow long focal length scopes.
They are not good at low magnifications.
My Skywatcher 90mm is particularly good.
But a high end astro refractor will be better.
Regards,
B.
Acuter Voyager Mak 80 £185 SRP but probably cheaper.
A good example should be good.
A high end 90 degree prism, but simple 10mm and 20mm supplied eyepieces.
One has to be lucky to get a really good one and it is advertised as f/10, although I suspect the real aperture may be less than 80mm and it is f/11 and even slower with some accessories.
Regards,
B.
A good example should be good.
A high end 90 degree prism, but simple 10mm and 20mm supplied eyepieces.
One has to be lucky to get a really good one and it is advertised as f/10, although I suspect the real aperture may be less than 80mm and it is f/11 and even slower with some accessories.
Regards,
B.
Thanks for all your comments.
I have a Maksutov SW 127 that I use for astronomical observation, and it presents very good images of the Moon and the planets, it supports high magnifications very well, but it does not handle low magnification well, so I am looking for a small instrument that works well in that environment low-medium powers, and I think this Mak 80 does not do it well at all.
I have a Maksutov SW 127 that I use for astronomical observation, and it presents very good images of the Moon and the planets, it supports high magnifications very well, but it does not handle low magnification well, so I am looking for a small instrument that works well in that environment low-medium powers, and I think this Mak 80 does not do it well at all.
