Re: "That's a REALLY nice 1500mm lens you have there"
- From: "dennis@home" <dennis@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 13 Apr 2007 08:57:19 +0100
"ASAAR" <caught@xxxxxx> wrote in message
news:2mct139pgc1lvteh2c8pgeumeebv4go0mu@xxxxxxxxxx
So now you're down to 366mm from 500mm, both of which are
significantly less than Nikon's 1000mm scope which (with its
adapter) is designed to interface with and provide data to a digital
camera. Anodized and plated could indicate a flimsy aluminum tube.
Maybe we could tell more about it, but you weren't proud enough of
your feeble telescope to have mentioned the name of the company that
manufactured it. Was it on sale at Radio Shack? :)
For what it's worth, what kind of image quality can we expect from
that 366mm telescope? As good as the images you'd get from one of
Nikon's 300mm lenses?
A well made astronomical telescope is way better than a camera lens.
I have never seen a *diffraction limited* optic for a camera.. do they
exist?
It is the norm for telescopes (excluding the toy ones).
As for the Nikon one adding exif info its not going to make the decision for
me.
I can always add the fixed apature and focal length manually.
I'm not sure about which way up the image is on the Nikkon as the 45 degree
mirror is an erecting prism which makes a spotting scope image the correct
way up.
So it will be inverted with respect to a proper lens/ telescope prime image.
Unless they are using the eypiece to do image projection which adds a focal
length multiplier and introduces optical defects.
If they are you can just hold a pair of binocculars infront of you lens to
take pictures (yes I have done that with my Optio WP where the lens doesn't
move).
The difference in focal length isn't very
significant and you can get an AF 70-300mm f/4-5.6G for as little as
$129.95 & $139.00 from B&H, or $294.95 & $319.95 for the better AF
70-300mmD ED version. You can pay as much as $479.95, but that's a
VR lens. They all have several advantages over your anodized
aluminum scope. All of the normal lens features, AF, metering and
passing lens data to the camera. They may also include the 5 year
extended warranty often included with some of Nikon's lenses. Do
you actually own that $299 lens and know how it performs, or do you
just know of it as a web surfer?
I bet my Meade 900mm F9 telescope out performs them, but its not going to
win in a usability trial.
Camera lenses compromise performance for usability and costs IMO.
They don't actually need much performance as neither film nor digital is as
good as the human eye.
.
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