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My favorite eyepiece is a security camera lens

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#1 Dr. Woo

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Posted 19 January 2014 - 02:49 AM

After searching through this forum I didn't come across any posts about using ccd camera lenses for eyepieces. My favorite EP is a camera lens that I hand filed the barrel down to 1.25".

This is also my wife's favorite EP and it excels on planetary and lunar observing. I would estimate it's in the 6-7mm range, and although it presents a somewhat dimmer image than my various plossl's it has awesome contrast.

Granted my most expensive piece is an Orion Ultrascopic, and I have never viewed through anything choice before, so maybe I just think it's good because I don't know better :lol:

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#2 Dr. Woo

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Posted 19 January 2014 - 02:52 AM

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#3 herrointment

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Posted 19 January 2014 - 04:20 AM

" so maybe I just think it's good because I don't know better."

Now you've done it.

#4 Dr. Woo

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Posted 19 January 2014 - 06:43 AM

" so maybe I just think it's good because I don't know better."

Now you've done it.

You mean :tonofbricks: ?

#5 Dr. Woo

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Posted 19 January 2014 - 06:47 AM

Well all I can say is it blows any plossl I've looked through into the weeds on planetary veiwing

#6 SteveC

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Posted 19 January 2014 - 10:03 AM

As the song goes, "love the one you're with".

#7 JustaBoy

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Posted 19 January 2014 - 04:09 PM

Dance with the one ya brung!

#8 GeneT

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Posted 19 January 2014 - 06:00 PM

Very interesting. I would never have thought. . . .

#9 photiost

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Posted 19 January 2014 - 10:31 PM

As long as you are happy with it !!

#10 CeleNoptic

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Posted 19 January 2014 - 10:54 PM

you forgot to tell us one minor thing: on what scopes do you and your wife use it? :grin:

#11 Dr. Woo

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Posted 20 January 2014 - 05:00 AM

you forgot to tell us one minor thing: on what scopes do you and your wife use it? :grin:

Mostly on a 10" Meade Starfinder GEM and now as of today a 6" F8 achromatic refractor. It seems to work better with fast optics, as noted today. It likes the F 4.5 mirror better

#12 planet earth

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Posted 20 January 2014 - 05:37 AM

Hi:
Any pics/drawings or info on the lens layout, which cam model etc?
Sam

#13 jpcannavo

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Posted 20 January 2014 - 07:57 AM

Could you be a bit more specific: eye relief, field of view, scatter, ghost images, correction at edge of field, etc.
Joe

#14 echoes1961

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Posted 20 January 2014 - 07:33 PM

It's like the first time you meet your wife and looking through this EP...birds started chirpin'. Sounds like you know what you're doing. Rock on!

#15 Dr. Woo

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Posted 21 January 2014 - 07:30 AM

From the closed thread in the ATM forum

What scopes are you using it in ? What's the afov? How's the field correction? What eyepieces are you using for comparison?

Jon

OK I checked it out again tonight and (please bear with me I'm new to this scope forum thing) using my 6" F8 Synta lensed home brew refractor, field curvature was only apparent at the very extreme edge of the field.

I don't know how to determine FOV so I timed a transit of Jupiter. From the time it entered with 50% of the planet visible. till exit with the same amount showing was 49 seconds.

This eyepiece is solidly in the middle of my Ultrascopic 3.8mm and a 9.something Meade 4000 series plossl, as far as magnification goes.

I've compared it to those EP's mentioned as well as other Meade, Celestron and Sirus plossls and MA's

#16 Dr. Woo

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Posted 21 January 2014 - 07:42 AM

Hi:
Any pics/drawings or info on the lens layout, which cam model etc?
Sam

Unfortunately I modified this piece more than 10 years ago, and don't have a clue anymore about any of the specifics. Looking at it I hazard to guess there are 3 separate lens groupings in it. It has a diopter built in which I don't use and leave wide open. The bottom lens takes up the entire inside of the barrel, nothing but lens looking at the bottom

#17 Dr. Woo

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Posted 21 January 2014 - 07:48 AM

Could you be a bit more specific: eye relief, field of view, scatter, ghost images, correction at edge of field, etc.
Joe

The eye relief is fair, a bit better than my Ultrascopic 3.8mm. I did note that if say a street light is able to illuminate the top of the EP that causes a serious problem, it's necessary to keep the piece in shadows or it becomes unusable due to external reflections

#18 Dr. Woo

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Posted 21 January 2014 - 08:12 AM

Here is an ebay search that has a boatload of different lenses all under 10 bucks shipped with most in the $5 range if anyone wants to experiment. I'm going to pick up a few more myself

http://www.ebay.com/...BIN=1&_nkw=s...






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