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Docter optics

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Category: Scopes
Forum Name: Rifle Scopes
Forum Description: Centerfire long gun scopes
URL: http://www.opticstalk.com/forum_posts.asp?TID=15013
Printed Date: March/29/2024 at 09:52
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Topic: Docter optics
Posted By: rifle shooter
Subject: Docter optics
Date Posted: January/28/2009 at 12:44
I was comparing my new Docter Optics 2.5 to 10 power scope to several other high quality scopes. I noticed that when the magnification was increased on the Docter the cross hairs got larger (mainly in the heavy duplex area away from the center).  None of the other scopes did it. A friend says that it is a sigh of a cheap scope. Anyone know anything about why this happens?



Replies:
Posted By: pyro6999
Date Posted: January/28/2009 at 12:47
different focal plane which in your case it sounds to me like your scope is a second focal plane and the other scopes you looked through are first focal plane scopes.


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They call me "Boots"
375H&H Mag: Yeah, it kills stuff "extra dead"

343 we will never forget

God Bless Chris Ledoux
"good ride cowboy"


Posted By: rifle shooter
Date Posted: January/28/2009 at 12:54
Could you please explain? Is one way better?
Thanks


Posted By: pyro6999
Date Posted: January/28/2009 at 12:55
this is straight from swfas "scope school"


The crosshair pattern inside the scope that is used to aim.  Reticles can be made of wire or etched onto the glass.  The reticle can be placed in the first focal plane (objective plane) like most European scopes.  This causes the size of the reticle to change proportionally with the power.  When the reticle is in the first plane it always covers the same amount of area on the target because the reticle grows at the same rate that the image does.  Very good for low light shots.

If the reticle is placed in the second focal plane (eye piece plane) the reticle will not change when the power is changed but the target will change in size.  The reticle will actually take up less area on the target when the power is increases because the target has been magnified but the reticle has not been magnified.  Very good for long range shots.





-------------
They call me "Boots"
375H&H Mag: Yeah, it kills stuff "extra dead"

343 we will never forget

God Bless Chris Ledoux
"good ride cowboy"


Posted By: Rancid Coolaid
Date Posted: January/28/2009 at 13:05
Originally posted by pyro6999 pyro6999 wrote:

this is straight from swfas "scope school"


The crosshair pattern inside the scope that is used to aim.  Reticles can be made of wire or etched onto the glass.  The reticle can be placed in the first focal plane (objective plane) like most European scopes.  This causes the size of the reticle to change proportionally with the power.  When the reticle is in the first plane it always covers the same amount of area on the target because the reticle grows at the same rate that the image does.  Very good for low light shots.

If the reticle is placed in the second focal plane (eye piece plane) the reticle will not change when the power is changed but the target will change in size.  The reticle will actually take up less area on the target when the power is increases because the target has been magnified but the reticle has not been magnified.  Very good for long range shots.





Not entirely accurate.  In low light, reticles tend to be more difficult to see.  At high magnification, the reticle can be easier to see than a comperable reticle on a SFP; however, at low magnification in low light (taking a shot on game not far away) the FFP reticle can all but disappear completely.

If you have not sued FFP, I advise you look through one before putting $$ down on one.  There are advantages to each, but a unilateral statement that FFP is better in low light is not accurate.


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Freedom is something you take.
Respect is something you earn.
Equality is something you whine about not being given.


Posted By: rifle shooter
Date Posted: January/28/2009 at 13:06
Makes sense. When I hunted in Europe while staitioned over there there were hardly ever long shots. However, there were lots of shots in poor light. The Germans are very big on scopes that perform well in low light conditions.


Posted By: Kickboxer
Date Posted: January/28/2009 at 14:07
Welcome to the forum, btw.  Good to have you aboard.

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Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living


Posted By: hunter12345
Date Posted: January/28/2009 at 14:53
Nothing wrong with your Doctor scope which has a the reticle in the second focal plane.That scope would be better for low light hunting conditions.Your friend must be jelous that you own a high quality scope and was saying that to upset you.Doctor scopes are made in Germany in the Zeiss factory and built like tanks. 


Posted By: Tip69
Date Posted: January/28/2009 at 22:07
Originally posted by rifle shooter rifle shooter wrote:

I noticed that when the magnification was increased on the Docter the cross hairs got larger (mainly in the heavy duplex area away from the center).  None of the other scopes did it.
 
After reading this thread, I think there is some confusion over which scope is First Focal plane(FFP) and Second.   He said the Docter's cross hairs got larger, that would indicate a FFP to me.


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take em!


Posted By: seawolf
Date Posted: January/29/2009 at 04:13
Tip69 is right.
Reticle in the first focal plane (FFP) increases as you crank up the magnification.
Reticle in the second focal plane (SFP) has the same size regardless of magnification.
 
Both systems has their pro and con.
In thight spots and dense wood I prefer the SFP and a bold reticle like  the #4 or Heavy Duplex.  Quick on target if game is moving and it stands out clear against dark background even on low magnification.
On more open land and in dusk and dawn, the FFP shines in my opinion.


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Seawolf


Posted By: 8shots
Date Posted: January/29/2009 at 05:24
I also think that FFP reticules have better application when used for ranging in conjunction with a mildot or other graded reticule,as the reticule and target remain in proportion to one another.



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