Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
9 Likes  #1
About Lens Hoods IMPORTANT!
Posted By: MightyMike, 01-19-2009, 12:49 PM

I have often said that i hate my FA50mm F1.4, sure its a sharp lens at F4.0, some say even at F2.8 but when i want the speed the sharpness
just isn't there, in fact the only fast lens i have that doesn't really suffer a lot from low sharpness wide open is my FA35mm F2.0...

In the case of the FA50, its all about low contrast, same goes for the F50 F1.7 and Sigma 24mm F1.8... and a little bit on the FA77mm F1.8 Ltd...
I know a hood is important for getting rid of stray unwanted light, but you really never no how important it is until you have a bad case of low
contrast for a given lens and you try a lens hood on it. in a personal review of the Sigma 24mm F1.8 someone wrote online they made a really
interesting point, The film (FF) lenses come with a hood that blocks stray light for the FOV related to full frame, however on a crop sensor the
hood needs to be 1.5 times longer to get the greatest benefit, he said he used his Sigma 70-200 F2.8 hood on his 24mm F1.8 without vignetting
and with far better contrast... the other thing we all should understand is that zoom lenses hoods are only good for the widest FOV...

with this in mind i picked up a lens hood off ebay said to be good for 37-90mm ore something like that, its a 49mm thread and its about 37mm
long and 60mm in diameter (it came with a 58mm lens hood)... the hood is longer then the built in hood of the 77Ltd too by about 1.3 times.

here are some of my conclusive test to confirm how much a lens hood helps

Testing back light glare 50mm F1.4 @ F1.4, F2.0, F2.8
what the test looked like


100% crops description written on photo







You can clearly see a marked improvement in contrast and overall sharpness

Now here is one test for the 77mm F1.8 at F1.8, no hood, built in hood, new hood

what the test looked like


100% crops


Look at the contrast in the text and the effect of purple ringing on the black dots

I hope this is clear for everyone now that the right lens hood is rather quite important to improve lens performance especially on fast
primes... now the next thing i have to look for is a larger hood to fit my 24mm F1.8

Last edited by Buddha Jones; 01-21-2009 at 06:01 PM. Reason: Made the 100% crops manageable.
Views: 39,865
01-19-2009, 01:02 PM   #2
Veteran Member
Gooshin's Avatar

Join Date: Sep 2007
Location: Toronto, the one in Canada.
Posts: 5,611
i use a lenshood designed for a film takumar 135mm on my FA43

until you get vignetting, there is no such thing as too much hood!

you also get slightly more accurate exposure.
01-19-2009, 01:05 PM   #3
Site Supporter
Rense's Avatar

Join Date: Dec 2008
Location: Zetten - The Netherlands
Photos: Gallery | Albums
Posts: 8,821
Amazing! Never thought that the length of a hood is so important. Have to go shopping...
01-19-2009, 01:06 PM   #4
Site Supporter
smigol's Avatar

Join Date: Sep 2008
Location: Menlo Park, CA
Photos: Albums
Posts: 401
Wow! I've been seeing this PF and fuzzy fringe with my own setup and have used the stock hood for it. I'm thinking about making an extension for the hood with some construction paper to see what I can find with the shots I try.

I like doing macro with my setup, so extending the hood might be good, but lighting would be its own challenge.

01-19-2009, 01:29 PM   #5
Veteran Member




Join Date: Sep 2006
Location: Mississippi, USA
Photos: Gallery
Posts: 564
Wonderful! Very nice work, you've got me measuring all my hoods.
01-19-2009, 01:41 PM   #6
Veteran Member
RBellavance's Avatar

Join Date: Nov 2006
Location: Near Montréal, Canada
Photos: Gallery
Posts: 1,716
Wow, I never would have thought the difference would be that great. Thanks !

However, I would like to comment on this:
QuoteOriginally posted by MightyMike Quote
the other thing we all should understand is that zoom lenses hoods are only good for the widest FOV...
That certainly is true for most lenses. However I was thinking about this very thing last week, and figured out that "reverse-zooming" lenses with a fixed hood are a great solution to this. Two examples I know of are the Nikkor 17-55/2.8 and Canon 24-70/2.8L: these zooms are longest (or thereabouts) at their "wide end", shortest at their "tele end", and the hood is stationary throughout.

I have never seem the DA16-45 or DA*16-50, so I don't know if their hood is designed the same way.
01-19-2009, 01:45 PM   #7
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,395
I have often commented that lens manufacturers should offer alternate hoods for ASP-C sensors.

there are sites that will allow you to custom design hoods to fit your sensor.

check the accessories forum.
01-19-2009, 01:46 PM   #8
Veteran Member
X Man's Avatar

Join Date: Aug 2008
Location: Maine
Photos: Gallery
Posts: 478
Thank you Sir, great lesson here! Fascinating!

01-19-2009, 01:48 PM - 1 Like   #9
Veteran Member
mithrandir's Avatar

Join Date: Nov 2007
Location: Maryland
Photos: Gallery
Posts: 1,890
Mike, Thanks for taking the time to check this out. An extra thanks for sharing the results.
01-19-2009, 02:05 PM   #10
Marketplace Reseller




Join Date: Nov 2008
Location: Canada
Posts: 5,106
Original Poster
QuoteOriginally posted by RBellavance Quote
Wow, I never would have thought the difference would be that great. Thanks !

However, I would like to comment on this:

That certainly is true for most lenses. However I was thinking about this very thing last week, and figured out that "reverse-zooming" lenses with a fixed hood are a great solution to this. Two examples I know of are the Nikkor 17-55/2.8 and Canon 24-70/2.8L: these zooms are longest (or thereabouts) at their "wide end", shortest at their "tele end", and the hood is stationary throughout.

I have never seem the DA16-45 or DA*16-50, so I don't know if their hood is designed the same way.
Great point RBellavance, also the Nikon 14-24mm F2.8 has a stationary hood
01-19-2009, 02:09 PM   #11
Site Supporter
Nowhere Matt's Avatar

Join Date: Nov 2007
Location: Nowhere Land
Photos: Gallery | Albums
Posts: 2,312
Another reason to come around this forum. It's full of kooks. And all kinds of kooks.
Very interesting experiment and very well demonstrated. I am sure many find it useful and we shall soon see the Marketplace flooded with cast away lens hoods.
01-19-2009, 02:40 PM   #12
Site Supporter
Vylen's Avatar

Join Date: Dec 2008
Location: Sydney, Australia
Photos: Gallery
Posts: 1,250
QuoteOriginally posted by Nowhere Matt Quote
Another reason to come around this forum. It's full of kooks. And all kinds of kooks.
Very interesting experiment and very well demonstrated. I am sure many find it useful and we shall soon see the Marketplace flooded with cast away lens hoods.
i think it'd be a bit silly to dispose of your lens hoods... just gaffer some cardboard onto your existing one, spray paint it black, and you're done :P
01-19-2009, 02:44 PM   #13
Marketplace Reseller




Join Date: Nov 2008
Location: Canada
Posts: 5,106
Original Poster
QuoteOriginally posted by Vylen Quote
i think it'd be a bit silly to dispose of your lens hoods... just gaffer some cardboard onto your existing one, spray paint it black, and you're done :P
I agree, there is no point it getting rid of your current hoods, they may be adequate in the cases of DA primes or they may be useful on other lenses, they can also be what you transform into a longer hood... and the reality is that this seems to affect the lenses with bad contrast the most, many lenses are pretty decent with the hood provided
01-19-2009, 04:08 PM   #14
Moderator PEG Judges
Kerrowdown's Avatar

Join Date: Aug 2008
Location: Highlands of Scotland.
Photos: Gallery
Posts: 32,163
First we all had LBA then CBA, now we got HBA to add to our list of ways to spend money.

I always use hoods on all lenses, instead of filters for both protection and stray light, but until now I never would have considered such an increase in contrast due to just a hood.

Thanks for the heads up.
01-19-2009, 04:32 PM   #15
Loyal Site Supporter
Canada_Rockies's Avatar

Join Date: Nov 2007
Location: Sparwood, BC, Canada
Photos: Gallery | Albums
Posts: 9,394
Thanks for the information! Very well presented.
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!
24mm, contrast, f1.4, f1.8, f2.8, hood, lens, light, sigma, test
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Do I need 2 lens hoods? lovemehate Pentax SLR Lens Discussion 24 10-16-2010 10:06 AM
What's more important when choosing a lens future_retro Pentax SLR Lens Discussion 19 08-02-2010 03:01 PM
lens hoods, lens caps, UV filters and camera storage Ed in GA Pentax SLR Lens Discussion 4 12-22-2007 01:40 PM
Lens hoods Trawlerman Pentax Camera and Field Accessories 1 09-11-2007 07:24 AM
What is the most important factor in choosing a lens? slip Pentax SLR Lens Discussion 10 12-11-2006 05:38 PM



All times are GMT -7. The time now is 02:39 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