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  #21  
Old 25-12-2018, 11:40 AM
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Astrofriend (Lars)
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I have written to Ivo who develop APT and ask if it's posiblie to override the need to switch the hardware button on the lens, man/auto focus. When usingis app Canon control I don't need to do that.
Lars
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  #22  
Old 03-06-2019, 05:04 AM
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Astrofriend (Lars)
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Hi,
It ended with a Canon 300 mm f/4 lens. With that I don't have to struggle to find a field flattener and the Canon 6D + 300 mm lens weight in at 2.2 kg. Together with this:

http://www.astrofriend.eu/astronomy/...er-tripod.html

I have a real portable equipment. But I'm not sure if my Astro Adventurer could handle this but have read that others have this to work. With a low readout noise and many short exposures the chance increase that it will work.

Then buy tickets down to Rhodes:

http://www.astrofriend.eu/astronomy/...nomy-cafe.html

We have summer in Sweden now but I can do some test with Moon as test object.

I can use this lens to daytime photography too.

Lars
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  #23  
Old 04-06-2019, 02:41 PM
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sil (Steve)
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Well there is only one answer to the thread title: RedCat 51 APO 250mm f/4.9 . I was using the lens that was regarded as the best at the time for either nikon or canon. The Redcat makes it look like a plastic kit lens. Super sharp and flat field. M48 threaded you just buy with whatever adapter you need to your camera body. Couple of samples on my astrobin page.

Last edited by sil; 04-06-2019 at 03:23 PM.
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  #24  
Old 05-06-2019, 09:00 PM
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Astrofriend (Lars)
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Hi Steve,
That's a very interesting lens. Have you found some good reviews, where they compare it relative Canon or Nikon full frame lenses?

I couldn't find that kind of test.

/Lars
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  #25  
Old 05-06-2019, 09:12 PM
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I have the Redcat 51 also and agree its a top lens/mini telescope.

More astro oriented than DSLR lenses.

Greg.
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  #26  
Old 06-06-2019, 09:37 AM
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Nikolas (Nik)
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How much is the redcat?
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  #27  
Old 06-06-2019, 11:27 AM
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Peter Ward
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How much is the redcat?
$A1375 inc GST
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  #28  
Old 06-06-2019, 11:39 AM
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$A1375 inc GST
Thanks Peter
When they come onto the second hand market, budget is tight currently
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  #29  
Old 06-06-2019, 01:28 PM
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Quote:
Originally Posted by Astrofriend View Post
Have you found some good reviews, where they compare it relative Canon or Nikon full frame lenses?

Read my post again, I have been using a highly regarded (ie tested) lens for years and the redcat blows it away. I dont need to find reviews for you I own the lens and speaking from experience. I've never seen a lens ever that was so pin sharp corner to corner. At any price. Under any brand. Especially for its size too I dont see anyone approaching this quality anytime in the near future. Its a manual lens so it wont even be something the consumer brands will feel the need to compete against plus of course f4.9 consumers will claim is far too slow, etc plus their kit lens goes to 300mm, etc. Its a quality product, the numbers mean squat compared to the results.
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  #30  
Old 06-06-2019, 01:41 PM
tim.anderson (Tim Anderson)
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Not sure if it is the *best* lens available, but in my opinion, the best value for money in this focal length range is the Canon EF 200mm f2.8L II USM. Very light, extremely sharp, works well with a full-frame sensor, sells for a tad over $AUD900.
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