17 replies to this topic

[ChallengerLM12]

Hello everyone. This is my second post on CN. The attached picture was taken through one of my many classic Japanese refractors using a handheld cell phone.

 

The picture is raw and has not been edited or processed in any way. The magnification is 250 X.

 

Given the aperture the image quality is in my opinion extraordinary and defies what is generally considered possible. To the eye the image is even sharper than the picture.

 

Would anyone like to hazard a guess as to which aperture they believe delivered the image?

 

Thank you for looking

 

 

[andycknight]

60mm ??

 

Regards

 

Andy.

[ChallengerLM12]

Yes 60mm

[Outback]

Hand held  cell phone  Wow  ! 

Most impressive ' thanks for posting . 

[Wildetelescope]

It does not defy optical physics:-).    The resolution you have here is what you would see at 150-200x, so at 250x you are not seeing MORE than you would at say 150x, but you do have a larger image scale which makes the details provided by the resolution of your scope easier to see.  The issue you would have to deal with at those mags is loss of light and dimming of the object.    The moon is a very bright object, so there is light to spare.  It is not uncommon to be able to go higher mag on the moon than other objects.   The fact that your image stays pretty sharp at these ultra high magnifications speaks to teh quality of your optic:-).  You can see that the image is a little soft, but that could be to your seeing conditions, or the high magnification or some combination of the two.  But it is still an excellent image you clearly have excellent optics in your scope!   Who made this one?  

 

JMD

[CHASLX200]

I used 450x all the time in my 60mm on the moon when i was 13.

[wolf man]

   Nice shot! Surprisingly little chromatic abberation. What make and model of classic refractor did you use? Thanks for sharing!

[konrad]

Yes when I had my Tasco 7TE and 10TE  (60mm and 76mm) thats what I got 

[deSitter]

On string theorists can defeat physics

 

What you need is a double star with similar magnitudes at around 2" arcseconds separation. Can someone think of one off the top of their heads? Star should be say 3rd-4th magnitude and companion 3rd-6th. 2" seconds of arc is around the theoretical limit of a 60mm scope. Happy hunting!

 

-drl

[dweller25]

I used 450x all the time in my 60mm on the moon when i was 13.

That’s gives an exit pupil of 0.13mm which would be hard to imagine being useful in any way - even for a 13 year old !

[CHASLX200]

That’s gives an exit pupil of 0.13mm which would be hard to imagine being useful in any way - even for a 13 year old !

I use crazy pow wow's all the time for kicks.

[dweller25]

I use crazy pow wow's all the time for kicks.

Wham Bang, thank you man, but x150 is the sensible max useable for a 60mm.

[scout]

Looks great. Tonight after the Super Bowl I'm taking out my Asahi-Pentax 60mm f/13.3 to look at the Moon.  I'll see if I can get a view like that at ~250x.

[CHASLX200]

That's roughly the thickness of two human hairs. But, hey, at least the image will be super dark and blurry. It's either total BS or just a dumb thing to do

BS jess? I use over 800 to 1100 a good bit in my bigger scopes. I always push scopes to nuts wow pow. Why would it be dumb?  .  You don't have my seeing or optics. Last nite was near 10 seeing and i was using a 2.5mm LV on Jup in my 12.5" F/5 Zambuto. Ya 450x is too much for a 60mm but don't mean you can't try it out on Venus or the moon.

[Outback]

The only 60mm scopes that can handle outrageous magnifications are the Royal Astro F/20s made in the early 60s .

 

If you ever get the chance to get one Don't hesitate     

[ChallengerLM12]

It does not defy optical physics:-).    The resolution you have here is what you would see at 150-200x, so at 250x you are not seeing MORE than you would at say 150x, but you do have a larger image scale which makes the details provided by the resolution of your scope easier to see.  The issue you would have to deal with at those mags is loss of light and dimming of the object.    The moon is a very bright object, so there is light to spare.  It is not uncommon to be able to go higher mag on the moon than other objects.   The fact that your image stays pretty sharp at these ultra high magnifications speaks to teh quality of your optic:-).  You can see that the image is a little soft, but that could be to your seeing conditions, or the high magnification or some combination of the two.  But it is still an excellent image you clearly have excellent optics in your scope!   Who made this one?  

 

JMD

 This is the telescope that produced the image - an O.K.K.K 60mm F 20 - Model OKT - 121 with a Circle K objective. I had never heard of the O.K.K.K brand. The scope is very rare in Australia and was listed in Perth 2150 miles, (3460km) from where I live. I had it sent by road transport to my home. Since I did not have a chance to use it before purchasing - and knowing that Kenko objectives (from what I have read) have a variable reputation and wouldn't or shouldn't be in the same class as a Royal - I took the risk since 60mm F20's are so rare. The risk paid off. The objective is outstanding. Very soon I will the opportunity to directly compare it to a Royal R-61D 60mm F20

 

Regards Andrew

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[davidc135]

I take a nerdy interest in the smallest craterlets and faintest lunar features an aperture can reveal and so would like to hear more, although the moon is out of action for a while.

 

David

[Wildetelescope]

 This is the telescope that produced the image - an O.K.K.K 60mm F 20 - Model OKT - 121 with a Circle K objective. I had never heard of the O.K.K.K brand. The scope is very rare in Australia and was listed in Perth 2150 miles, (3460km) from where I live. I had it sent by road transport to my home. Since I did not have a chance to use it before purchasing - and knowing that Kenko objectives (from what I have read) have a variable reputation and wouldn't or shouldn't be in the same class as a Royal - I took the risk since 60mm F20's are so rare. The risk paid off. The objective is outstanding. Very soon I will the opportunity to directly compare it to a Royal R-61D 60mm F20

 

Regards Andrew

Please post the results from that comparison either here or in the Classics page.   I would be very interested in hearing about it.  I have an excellent 80 mm Towa that gives similar performance.  They too have a rep for variable quality but I think I have a very good sample.

JMD