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My VERY BIG lens came today!
Dec 7, 2015 22:44:02 #
Dec 7, 2015 23:22:18 #
Dewman wrote:
Holy Cow! I knew it was big, but I wasn't expecting it to be THIS big! And heavy? OMG!
I have one just like it. It is not so good wide open and does much better at f8, and even better at f11. When wide open, it can bloom quite a bit.
This lens is not exactly a great lens for astrophotography since it blooms a lot when wide open. Here is a shot of Messier 103, the star cluster in the center. Notice the bright star at the lower left which is showing the aperture blades. I am guessing this was about f8. The f4.5 was not real usable for stars at all. But stopped down, they are quite nice pin points. I considered showing an image at f4.5, but it looks so bad, I decided not to show it. There is a lot of CA and blooming.
Second picture is at a distance of perhaps 1.5 miles. There was some CA which was reduced in Lightroom, and it did affect the sharpness. It was at its worst with the bright white roof.
Third picture was taken at f11. And this one turned out the sharpest. It is also cropped quite a bit to see the sharpness.
Messier 103 - 500mm Pentax on equatorial mount
(Download)
Daylight sample, f8, 1/640 sec, ISO 100, Sony A57 (crop sensor camera)
(Download)
This shot at f11 and cropped. The CA is now mostly gone.
(Download)
Dec 8, 2015 00:52:48 #
Dewman wrote:
It is a SMC Pentax 500mm f:4.5 lens. This sucker weighs 7.7 lbs.!
Jeezzzzz, for a second there...., I though you actually meant BIG!!!!! :lol: :lol:
Does that puny little thing only have ONE hood?!?!
SS
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Dec 8, 2015 05:24:30 #
Dewman wrote:
Holy Cow! I knew it was big, but I wasn't expecting it to be THIS big! And heavy? OMG!
She'll close those blinds now.
Dec 8, 2015 06:20:05 #
Dec 8, 2015 06:21:44 #
Dec 8, 2015 06:32:44 #
Dewman wrote:
Holy Cow! I knew it was big, but I wasn't expecting it to be THIS big! And heavy? OMG!
And itÂ’s half the size of the 1000mm f/8. :)
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Dec 8, 2015 07:10:25 #
Dewman wrote:
Holy Cow! I knew it was big, but I wasn't expecting it to be THIS big! And heavy? OMG!
Yes, definitely big. I wonder how the camera likes all that weight hanging off the mount. Luckily manufacturers have learned how to make them smaller, lighter, and better.
Dec 8, 2015 07:14:52 #
Dec 8, 2015 07:17:42 #
S. Hemmingsen wrote:
So SIZE does matter?
Gotta have the biggest one. Proving it is key.
Dec 8, 2015 07:18:05 #
You need to hire a Sherpa to carry your camera equipment. Good shooting with it.😊😊😊
Dec 8, 2015 07:18:16 #
Dec 8, 2015 07:19:55 #
Now you can take a picture of the windmill from the next county. :lol: :lol: :thumbup: :thumbup:
Dec 8, 2015 07:26:35 #
Dewman wrote:
It is a SMC Pentax 500mm f:4.5 lens. This sucker weighs 7.7 lbs.!
Smile! It's a pound lighter than my Canon 500 f/4!
Dec 8, 2015 07:33:18 #
Whow...Can't wait to see some Images you capture with this telescopic Instrument...!!! :-D
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