Toronto Photography Meetup Group

TPMG.CA
It is currently Thu Oct 23, 2025 4:59 pm

View unanswered posts | View active topics


Board index » Photography Forums » Gear and Equipment

All times are UTC - 5 hours [ DST ]



Post new topic Reply to topic  Page 1 of 1
  [ 7 posts ] 
  Previous topic | Next topic 
Author Message
maureenlittlewood
PostPosted: Mon Jul 12, 2010 1:01 am 
Offline
TPMG Moderator
User avatar

Joined: Wed Jun 27, 2007 10:46 pm
Posts: 2251
Location: Scarborough
Has thanked: 2 times
Have thanks: 4 times
Flickr: http://goo.gl/5lJUf
Saw this lens and couldn't believe the price. Less than $300.00

It is actually a 650-1300mm lens with a 2x convertor

Not alot of specs on this lens but did find some info

http://www.amazon.com/dp/B001GKRRAO/ref ... B001GKRRAO -- Amazon price and few details

http://best-lens.blogspot.com/2009/10/o ... ition.html - more details

Not sure how the quality of pictures would turn out with that but it would be interesting to see.
Top
 Profile  
Reply with quote  
Shuttereye
 Post subject:
PostPosted: Mon Jul 12, 2010 1:08 am 
Offline

Joined: Wed Jul 08, 2009 12:19 pm
Posts: 512
Has thanked: 0 time
Have thanks: 1 time
I wouldn't go near that Maureen. Keep your money and go for something else. The focal range is too wide and at the price, I am very skeptical of the glass qualities they are using.
Top
 Profile  
Reply with quote  
maureenlittlewood
 Post subject:
PostPosted: Mon Jul 12, 2010 1:15 am 
Offline
TPMG Moderator
User avatar

Joined: Wed Jun 27, 2007 10:46 pm
Posts: 2251
Location: Scarborough
Has thanked: 2 times
Have thanks: 4 times
Flickr: http://goo.gl/5lJUf
Not looking to buy it.

Though it was an interesting length and so cheep. Hadn't seen any lens with that focal length before.
Top
 Profile  
Reply with quote  
Shuttereye
 Post subject:
PostPosted: Mon Jul 12, 2010 1:19 am 
Offline

Joined: Wed Jul 08, 2009 12:19 pm
Posts: 512
Has thanked: 0 time
Have thanks: 1 time
My bad. The price is really tempting :lol:
Top
 Profile  
Reply with quote  
mikefellh
 Post subject:
PostPosted: Mon Jul 12, 2010 1:43 am 
Offline
TPMG SUPERSTAR
User avatar

Joined: Sat Sep 23, 2006 12:49 am
Posts: 2012
Location: Leaside
Has thanked: 0 time
Have thanks: 0 time
Avoid brands like Opteka, Crystal Optics, or any lens that says "high definition" or "professional"...if you have to advertise a lens as "professional" chances are it isn't. Pros know what is or isn't good, it's the average consumer that they are trying to fool.
Top
 Profile  
Reply with quote  
hotwire
 Post subject:
PostPosted: Mon Jul 12, 2010 8:02 am 
Offline
TPMG Moderator
User avatar

Joined: Mon Jan 15, 2007 3:52 am
Posts: 4022
Location: Newmarket
Has thanked: 0 time
Have thanks: 2 times
Flickr: http://goo.gl/RJbMu
Avoid. Full Stop.
Top
 Profile  
Reply with quote  
fizbot
PostPosted: Mon Jul 12, 2010 10:52 am 
Offline

Joined: Tue Aug 28, 2007 8:35 pm
Posts: 568
Has thanked: 0 time
Have thanks: 0 time
Flickr: http://www.flickr.com/photos/fizbot/
maureenlittlewood wrote:
Saw this lens and couldn't believe the price. Less than $300.00

It is actually a 650-1300mm lens with a 2x convertor

Not alot of specs on this lens but did find some info

http://www.amazon.com/dp/B001GKRRAO/ref ... B001GKRRAO -- Amazon price and few details

http://best-lens.blogspot.com/2009/10/o ... ition.html - more details

Not sure how the quality of pictures would turn out with that but it would be interesting to see.


It's pretty much useless actually because of the small aperture. If you use the 'rule of thumb' that you want your shutter speed to be 2x the focal length, then at 650mm, you want to be shooting at 1/1300th of a second or better. Very tough to do at f/8 unless you are taking pictures of the sun :-). Now this is BEST case as it only goes downhill from there.

At 2600mm, you would want 1/5000th of a second, but you have to shoot at f32! Not sure what the minimum focus distance would be, but I'm pretty sure that you won't be able to use your flash to fill in any missing light :-)

Also, you won't get any auto-focus at any f-stop and at f32, you probably won't even be able to see anything through your viewfinder.


Summary from the Web:
[quote]This lens has an effective fixed aperture of 81.25mmm. Therefore, when it is zoomed in to 650mm, it has a relative aperture of f/8, and when it is zoomed out to 1300mm, it has a relative aperture of f/16.

Adding a 2
Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 1
  [ 7 posts ] 

Board index » Photography Forums » Gear and Equipment

All times are UTC - 5 hours [ DST ]

Who is online

Users browsing this forum: No registered users and 8 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group