Shooting the breeze Dowry Hill FTC  
Go Back   Shooting the breeze > The Chat > General Airgun Chat

General Airgun Chat Chat and banter that doesn't fit anywhere else...

Reply
 
Thread Tools Display Modes
  #11  
Old 19th March 2012, 06:38 PM
KNIFEMAN's Avatar
KNIFEMAN KNIFEMAN is offline
Member
 
Join Date: Mar 2012
Member of: EAST DEVON FT
Location: BARNSTAPLE
Posts: 36
Default 50 ft adaptor

If you decide to wind out the front element of your scope in order to focus at the shorter ranges to avoid the need for a 50 ft adaptor the inevitable will happen. The distances between the marks you have for 55and 50 yards will decrease. The reason this happens is because winding out the front element shortens the actual focal length of your scope. This results in the lens compressing the distance between the ranges on your sidewheel
Reply With Quote
  #12  
Old 19th March 2012, 07:41 PM
wiseguy's Avatar
wiseguy wiseguy is offline
Senior Member
 
Join Date: Apr 2010
Member of: DFTA
Location: Leende, NL
Posts: 319
Default

Quote:
Originally Posted by KNIFEMAN View Post
If you decide to wind out the front element of your scope in order to focus at the shorter ranges to avoid the need for a 50 ft adaptor the inevitable will happen. The distances between the marks you have for 55and 50 yards will decrease. The reason this happens is because winding out the front element shortens the actual focal length of your scope. This results in the lens compressing the distance between the ranges on your sidewheel
Does this also work the other way, so changing the focal lenght of your scope to increase the distance between the 50-55 yrd marks?
If this means the closest focus point will move you always have the cfa to overcome this issue.
Regards,
Rob
__________________
Steyr LG110 FT
http://www.fieldtarget.nl
Now only learn how to shoot....
Reply With Quote
  #13  
Old 19th March 2012, 08:41 PM
Ratinator Ratinator is offline
Senior Member
 
Join Date: Jan 2010
Member of: Millride FTC
Location: stourport
Posts: 2,576
Default warranty

If you change the focal ring it will slightly improve your top end gap's but this is not alway's the case.
If you start getting towards the end of travel on the wheel you may find that it put's them closer together.
My advise would be if it ain't broke don't fix it,you may find one day you will have to send it back for repair and they will possibly not honor the warranty if you have fiddled with it.
__________________
Tench converted Anschutz 9015
Bought from Theratworks
Iceni 89.5 /78.9/85.7/72.3/85.7/
41st in the world 16th best score Wales 2017
Reply With Quote
  #14  
Old 19th March 2012, 10:01 PM
Conor's Avatar
Conor Conor is offline
Never has been banned from sales
 
Join Date: May 2009
Member of: Nelson & Nomads airgun club
Location: Ardboe, Co.Tyrone.
Posts: 2,835
Default

Also with the gaps too big you loose the snap in/out.
__________________
He who never made a mistake never learned!
He who never missed never shot!
Reply With Quote
  #15  
Old 20th March 2012, 06:52 AM
wiseguy's Avatar
wiseguy wiseguy is offline
Senior Member
 
Join Date: Apr 2010
Member of: DFTA
Location: Leende, NL
Posts: 319
Default

Quote:
Originally Posted by Conor View Post
Also with the gaps too big you loose the snap in/out.
Good point indeed, tha's what I like most on my BN3 at the moment and don't want to lose.
Now using a rowan sidewheel this year, a bit bigger in diameter so also increasing the gap without losing the focus snap in/out.
Thanks,
Rob
__________________
Steyr LG110 FT
http://www.fieldtarget.nl
Now only learn how to shoot....
Reply With Quote
  #16  
Old 20th March 2012, 08:01 AM
palmanda palmanda is offline
Senior Member
 
Join Date: Apr 2009
Member of: Broadland FT
Location: Great Yarmouth
Posts: 328
Default

I dont really want to change my scope as I have resonable gaps at the higher end ranges. Placing my scope a little higher should also benifit the top end ranges by decreasing the amount of clicks at 45-55 yards.

the downside is my clicks will increase at the lower ranges, my Big Nikko will barely focus at 10 yards and those 15mm kills at 8-9 yards are really unforgiving

Hense me looking at a close focus adaptor

The fact i am a crap shoot also dosnt help much
Reply With Quote
  #17  
Old 20th March 2012, 04:09 PM
KNIFEMAN's Avatar
KNIFEMAN KNIFEMAN is offline
Member
 
Join Date: Mar 2012
Member of: EAST DEVON FT
Location: BARNSTAPLE
Posts: 36
Default 50 ft adaptor

Yes wiseman if the focal length of the scope is efectivley increased the exact opposite occurs, you would then really needthe cfa
Reply With Quote
  #18  
Old 2nd April 2016, 09:00 PM
iscao iscao is offline
Senior Member
 
Join Date: Dec 2015
Location: Oporto
Posts: 111
Default

Hi there

The close focus from what i read its nothing more then a close up lens used on photography.
If you know exactly the dioptres you can go to your local glass shop and make one, custom size away cheaper than the leupold...

Does anyone knows how much dioptres it's? I read about 0.25D but...

Regards
Reply With Quote
  #19  
Old 3rd April 2016, 09:55 AM
rich's Avatar
rich rich is offline
Senior Member
 
Join Date: Nov 2008
Location: Shebbear, N Devon
Posts: 1,741
Default

It's a lot less than that, about 0.017 dioptres, if you want to model the Leupold design.

Do we still have 15mm targets under 10 yards? I recall SWEFTA outlawed them a year or two ago due to risk of bounce back.
Reply With Quote
  #20  
Old 3rd April 2016, 07:25 PM
TonyF's Avatar
TonyF TonyF is offline
SWEFTA FT Champion 2006
 
Join Date: Nov 2008
Member of: Mendip, East Devon, Avon Hawks and Oaktree.
Location: Bristol, England
Posts: 1,012
Default

Correct Rich, so did the BFTA .... NO targets under 10 Yards due to safety reasons.
__________________
AA Field Target Team 2007~2011
East Devon FTC - SWEFTA Club Champions 2006/2007/2008/2009/2010 & 2013/2014/2015
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Close focus adapter?? Steve General Airgun Chat 8 2nd November 2010 05:04 PM


All times are GMT. The time now is 01:03 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
shooting-the-breeze.com Skin design and concept by Attitude