Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-06-2012, 08:05 AM   #1
Senior Member




Join Date: Oct 2009
Location: houston
Posts: 165
My k-5 Long distance 100-1000 yard shooting? lens selection?

Is there a budget way to go about shooting long distance rifle targets (video). I dont know if a Pentax SMCP-FA 80-320mm f/4.5-5.6 will suffice? even with a teleconverter... Im thinking about using a 1000-1200mm refractor telescope with a dslr camera mount? Can anyone offer any advice? I plan on using my k5 with this lens setup as a recordable "spotting scope" out on our gun range. I want to stay around 400 bucks or cheaper... I know Astrotech makes some nice smaller scopes that might work out.



Or how about a 1300mm AT6RC?

http://i.ebayimg.com/t/Astro-Tech-72mm-f-6-Doublet-Refractor-White-Telescope-AT72WH-/00/s/NDUyWDM3NQ==/$(KGrHqN,!jkFBN81Er8rBQmyVcqv1Q~~60_12.JPG

12-06-2012, 08:29 AM   #2
Veteran Member
Dr_who's Avatar

Join Date: Jun 2009
Location: Edmonton, Alberta, Canada
Photos: Gallery | Albums
Posts: 690
It's probably doable, your won't have snappy auto focus and all that but I'm sure your quite aware of that. If your going to have that as a len and use a dslr tripod, I would make sure to find a way to mount it by the lens as those scopes can get heavy fast. Also something to consider is if your going thru a telescope your view will possibly be inverted upside down. If your not doing alot of panning or moving that might be alright... it may not even apply to refractors but just reflectors...I honestly not sure at the moment but its another thing to consider.
12-06-2012, 08:44 AM   #3
Senior Member




Join Date: Oct 2009
Location: houston
Posts: 165
Original Poster
ya If its inverted then using it as a live "spotting scope" would not work too well.

Ive been doing some heavy googling and have yet to find anyone using one of AstroTechs RC telescopes as a long distance lens.
12-06-2012, 10:33 AM   #4
Emperor and Senpai
VoiceOfReason's Avatar

Join Date: Jun 2010
Location: Nashville, IN
Posts: 5,419
There is a guy selling a Sigma 170-500 for 375 in the sales part of the forum. Maybe that will work for you. If not then that and a teleconverter should.

12-06-2012, 10:47 AM   #5
Senior Member




Join Date: Oct 2009
Location: houston
Posts: 165
Original Poster
thanks, that would would great with a 2x tc... now I need to go on the search for a decent one
12-06-2012, 11:22 AM   #6
Emperor and Senpai
VoiceOfReason's Avatar

Join Date: Jun 2010
Location: Nashville, IN
Posts: 5,419
If I hadn't just got a 150-500 HSM that would have already been on it's way to me.
12-06-2012, 11:32 AM   #7
Senior Member




Join Date: Oct 2009
Location: houston
Posts: 165
Original Poster
what TC should I look at getting with that sigma? its not listed on sigmas "working lenses" list for the 1.4x and 2.0x
12-06-2012, 11:45 AM   #8
Emperor and Senpai
VoiceOfReason's Avatar

Join Date: Jun 2010
Location: Nashville, IN
Posts: 5,419
To tell the truth you're most likely going to have to manual focus on that because as with any of the ones that that aperture it's not going to let enough light in to autofocus. With a 2x teleconverter you're going to find that in addition to doubling focal length it doubles aperture too. Still, with shooting normally taking place in well lit conditions I wouldn't think that would be too much of a problem.

Of course I've seen people who said they have gotten things like this to autofocus with no problem. I've just bought a teleconverter from someone on here for cheap, so when I get it in I can test it on my Sigma 150-500 HSM and if it works I'll let you know what it is and where to get one.

12-06-2012, 12:06 PM   #9
Senior Member




Join Date: Oct 2009
Location: houston
Posts: 165
Original Poster
AF on the TC is a non issue. I will be shooting at targets placed at fixed distances and will manually focus to them... I may even go the Eye-Fi route with a netbook but Im not sure how well that could be implemented with long videos...
12-06-2012, 03:59 PM   #10
Pentaxian




Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 10,845
If you don't need AF and are shooting static targets, maybe you should get a Pentax Q with a Q to K adapter and a 200 or 300mm prime - instant 1100-1650mm reach, and probably better image quality that a f8 refractor used with a 2x teleconvertor!

Could be cheap too - get a used original Q from the marketplace here or eBay, get a eBay Q to K adapter, get an old Pentax K or M 200 or 300mm prime, or even an old zoom.

The 'reach' of the Q

As an optional extra, plug in a cheap Lilliput field monitor off eBay into the Q to display what you see on a 5 or 7 inch LCD screen.
12-06-2012, 04:52 PM   #11
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,298
How about setting up a wireless target camera, down range closer to the target, so you can get usable video quality.
At close range the refractor idea is good but when you start pushing the magnification for longer distances, you will end up with a jittery, heat-distorted mess.
12-06-2012, 05:22 PM   #12
New Member




Join Date: Dec 2012
Posts: 7
QuoteOriginally posted by p0opstlnksal0t Quote
Is there a budget way to go about shooting long distance rifle targets (video). I dont know if a Pentax SMCP-FA 80-320mm f/4.5-5.6 will suffice? even with a teleconverter... Im thinking about using a 1000-1200mm refractor telescope with a dslr camera mount? Can anyone offer any advice? I plan on using my k5 with this lens setup as a recordable "spotting scope" out on our gun range. I want to stay around 400 bucks or cheaper... I know Astrotech makes some nice smaller scopes that might work out.



Or how about a 1300mm AT6RC?

http://i.ebayimg.com/t/Astro-Tech-72mm-f-6-Doublet-Refractor-White-Telescope-AT72WH-/00/s/NDUyWDM3NQ==/$(KGrHqN,!jkFBN81Er8rBQmyVcqv1Q~~60_12.JPG

hello,
a 500mm refractor + 2x will give you 1500mmFL(35) on K5

regards,

?????: Digiscoping
12-06-2012, 07:12 PM   #13
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,298
QuoteOriginally posted by gleeman Quote
hello,
a 500mm refractor + 2x will give you 1500mmFL(35) on K5

regards,

?????: Digiscoping
Very nice setup. Like the red-dot. But I doubt that it would do much good at 800 meters or so, looking at sub 1/2 " holes in targets.

Last edited by Ex Finn.; 12-06-2012 at 07:22 PM. Reason: Clicked on the link.
12-19-2012, 04:10 PM   #14
Junior Member
sindbad1's Avatar

Join Date: Jun 2010
Location: Germany
Posts: 45
The refractor from Pentax is nice but I prefer the cheaper ED Refraktors from Sky-Watcher.
On my website are some pictures. Sorry, the language is german. Look at the pitures. They are clear enough.



Skywatcher Pro ED 80 Apo Refraktor


Here is a comparison of what telescopes perform with a DSLR.
Vergleich Teleobjektive Tokina SD 400mm Pentax smc DA 55-300 Sigma Ultra-Mirror 500mm Soligor Maksutov 500mm

Use Google Translate if you want to read the comments under the pictures. On the left side you can see the full pictures and next to them a crop.

Tom
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, distance, dslr, k-5, k-5 ii, k-5 iis, k5, lens, pentax k-5
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
My K-5 turned off while I left it for interval shooting :-/ Vicboy Pentax K-5 9 02-23-2012 03:35 PM
K-5 Lens Selection - Please Help Eliglass Pentax K-5 11 05-26-2011 10:58 PM
what will be the better lens selection for portrait shooting ahniao78 Pentax SLR Lens Discussion 5 11-21-2010 06:50 AM
Working distance versus object size and lens selection crawlars Pentax SLR Lens Discussion 4 02-17-2010 12:13 PM
Shooting around my yard jgredline Post Your Photos! 2 09-19-2008 12:06 AM



All times are GMT -7. The time now is 09:36 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top