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Scope Design (Read 99696 times)
Philip_Austin
Participating Member
Offline
Posts: 13
Location: Ohio
Joined: Dec 26
th
, 2007
Re: Scope Design
Reply #90 -
Jan 13
th
, 2009 at 8:30pm
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I finally got my scope put together (minus crosshairs) and was very pleased with how it turned out. I'll hopefully get the crosshairs in the next week or so. Thanks for your excellent guidance and article in the most recent magazine.
Philip
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sharps54
Ex Member
Re: Scope Design
Reply #91 -
Jan 20
th
, 2009 at 8:31pm
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I got the latest issue today and read the build article while standing in line at the post office. Wow, this is great! Thanks for all your work. Now I just need to talk my machinist buddy into helping with the project...
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nuclearcricket
Oldtimer
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Posts: 741
Joined: Oct 15
th
, 2008
Re: Scope Design
Reply #92 -
Jan 21
st
, 2009 at 9:29am
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Dead Eye, In reading your build instructions on here, you mention making a bushing to reduce the amount of light coming through the scope. My question is this, can you combine the light reducing bushing with the cross hair bushing? My reason for asking this it, it will save a little weight, prevent having to drill and tap 2 more holes. I guess in general I am just looking for any shortcut that will not hurt anything.
Sam
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dead_eye
Ex Member
Re: Scope Design
Reply #93 -
Jan 21
st
, 2009 at 1:33pm
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I haven't tried making the hole that small for the cross hair cell. I would like to know how it works if you try. The only thing is you might loose some field of view doing that way. the field of view is all ready limited because of the diameter of the lenses.
It would be a good experiment. the first one i built i did not use the reducer and could not see anything. i had to much light through the tube. when looking thought the scope it was a white blur once the reducer was placed in it cut light and was able to see thought the scope i had to play with the hole diameter until I was happy with the brightness of the scope. Just remember to start small with this hole and open it slowly until it is bright enough for your liking. try to not get so big that you get ghosting around the edges.
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proud terrorist
Ex Member
Re: Scope Design
Reply #94 -
Jun 30
th
, 2009 at 5:25pm
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what ocular lense you gents use for a 3 inch or so eye relief ?...I'm debating a fixed scope instead of sliding...and wanting to keep the power down around 5,6,7 or so...I have not started the scope yet, still kicking around ideas and design before I start.
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proud terrorist
Ex Member
Re: Scope Design
Reply #95 -
Jul 13
th
, 2009 at 5:57pm
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Has anyone here sucessfully built a scope according to these directions besides deadeye ?......I have the lens and cells made but no matter what, I get an upside down sight picture...any body have a clue why this would happen ?
Thanks
Ron
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Jeff_Schultz
ASSRA Board Member
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Posts: 1600
Location: Ransomville, NY
Joined: Apr 25
th
, 2004
Re: Scope Design
Reply #96 -
Jul 13
th
, 2009 at 6:08pm
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Perhaps you left out the erector lens?
"We have met the enemy and he is us." Pogo
“There is no situation so bad that it cannot be made worse."
Confidence- The feeling you get before you fully understand the situation.
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proud terrorist
Ex Member
Re: Scope Design
Reply #97 -
Jul 13
th
, 2009 at 7:35pm
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OK< finally got it, I had to move the objective out to 35 inches, anything less will not work, I have 279 up front, then 97 then 42 for ocular.
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Last Edit: Jul 13
th
, 2009 at 10:35pm by
»
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DonH
Ex Member
Re: Scope Design
Reply #98 -
Jul 18
th
, 2009 at 12:50pm
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Has anyone successfully built one of these scopes in a shorter than 30" length? If so, what focal length lens did you use and what magnification (power) did you achieve?
I am contemplating a 23"-24" length of between 10X and 15X. I will appreciate any help (info) I can get as a build is necessary to get the magnification I need.
Thanks
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proud terrorist
Ex Member
Re: Scope Design
Reply #99 -
Jul 18
th
, 2009 at 2:30pm
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Don if you go to Edmund Optics online and email the support they will help you, I emailed a guy there and he gave me the lens number and ran through a program to figure the distances and FL needed for a specific eye relief and scope length, for what I gave him I needed to buy the 55 dollar lens, so I just saved the info for now and used the lens listed above, only thing is for 45/70 I will need to put a slot and rail system on the scope so it will slide forward upon firing, the eye relief I have is just to close..anyway if you tell them the power you want, eye relief, scope length and lens diameter they will figure out all the specs and lens size for you.
EMAIL this guy
Eric Herman (EHerman@edmundoptics.com)
«
Last Edit: Jul 18
th
, 2009 at 3:50pm by
»
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alemonkey
Junior Member
Offline
Posts: 83
Location: Lincoln
Joined: Feb 27
th
, 2009
Re: Scope Design
Reply #100 -
Jul 26
th
, 2009 at 4:42pm
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This may be a dumb question, but do the cells have to be made of brass? Would aluminum work just as well?
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dead_eye
Ex Member
Re: Scope Design
Reply #101 -
Jul 29
th
, 2009 at 4:33pm
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That is not a dumb question. I don't see why you couldn't use aluminum. the reason for brass is traditional. You could use steel or plastic it is all up to the builder on what material is used.
Please Post Pictures
For others to see what you have built.
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proud terrorist
Ex Member
Re: Scope Design
Reply #102 -
Aug 4
th
, 2009 at 3:40pm
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it aint much but here's mine so far, I'm working on the bases now.
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Last Edit: Aug 6
th
, 2009 at 6:53pm by
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alemonkey
Junior Member
Offline
Posts: 83
Location: Lincoln
Joined: Feb 27
th
, 2009
Re: Scope Design
Reply #103 -
Aug 4
th
, 2009 at 7:00pm
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That looks really nice made out of brass. What did you use for the knurled sections?
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proud terrorist
Ex Member
Re: Scope Design
Reply #104 -
Aug 4
th
, 2009 at 7:32pm
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I used aluminum for cells, and brass for everything else, and 8-40 gun screws for all the screws
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Last Edit: Aug 7
th
, 2009 at 4:42pm by
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