Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
11-11-2009, 06:59 PM   #1
Loyal Site Supporter
Loyal Site Supporter




Join Date: Dec 2006
Location: Wherever I’m Parked
Photos: Gallery
Posts: 1,003
R72 filters and step-up rings question

I'm finally in a position to buy a Hoya R72 filter and try my hand at IR photography. I've been reading through the various threads here about IR and have some idea of what to expect and which lenses I have that will work OK with IR. The one thing I wonder about is whether I should buy a filter to fit the largest lens I'm likely to use and use step-up rings to fit the other lenses (what I do for my circular polarizer) or if that would allow extra light in that would affect pictures? Should I buy a filter that fits the lens I'll use the most? I haven't really decided which one I'd be most likely to use, so the step-up rings would be my preference if it will work.

Thanks for any information on this!

11-12-2009, 07:55 AM   #2
Veteran Member
alohadave's Avatar

Join Date: Jan 2008
Location: Quincy, MA
Photos: Gallery | Albums
Posts: 2,024
QuoteOriginally posted by mtngal Quote
I'm finally in a position to buy a Hoya R72 filter and try my hand at IR photography. I've been reading through the various threads here about IR and have some idea of what to expect and which lenses I have that will work OK with IR. The one thing I wonder about is whether I should buy a filter to fit the largest lens I'm likely to use and use step-up rings to fit the other lenses (what I do for my circular polarizer) or if that would allow extra light in that would affect pictures? Should I buy a filter that fits the lens I'll use the most? I haven't really decided which one I'd be most likely to use, so the step-up rings would be my preference if it will work.

Thanks for any information on this!
I would get the largest size you are going to use on a regular basis and use rings to step up or down as needed. It would be better to have a bigger filter to eliminate vignetting on wider lenses. I bought a 52mm filter right before I bought my 16-45 and wish I had bought a larger filter instead.

The rings aren't going to let light in.
11-12-2009, 08:46 AM   #3
Loyal Site Supporter
Loyal Site Supporter




Join Date: Dec 2006
Location: Wherever I’m Parked
Photos: Gallery
Posts: 1,003
Original Poster
Thanks for the reply - in some ways that's not entirely what I wanted to hear as I'm tempted to buy a 77 mm. However, I doubt I'd use a 300mm lens much for IR and it was amazing how expensive they are, compared to one that's 52 or 55 mm. If the DA 12-24 weren't on the unfriendly list, I'd definitely get the 77 mm, but now I'm not so sure I could justify the significant extra cost. I already have step-up rings for 67-77 and 52-77, but rings aren't very expensive.

Since the DA*50-135 is on the list as IR unfriendly lenses, I think I'll buy a 55 mm lens for the DA 55-300 and then get a 52 to 55 step-up ring for the kit lens (most likely to use) and a macro (not that likely but possible) and a 49-55 step-up ring for the 77 Ltd. Does that sound like a reasonable plan?
11-12-2009, 09:06 AM   #4
Veteran Member




Join Date: May 2009
Location: Twin Cities, MN
Posts: 2,867
Who said the 50-135 is IR unfriendly? Where is this list?! I would like to see it

I do think your plan is reasonable - the 55-300 I think is still quite useful as far as focal length.

11-12-2009, 01:21 PM   #5
Site Supporter
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland. Espoo. Kouvola.
Photos: Gallery | Albums
Posts: 7,960
I went with the 58mm R72 for DA 55-300 and A 70-210 f4.
Plus 49-58mm step up for my A 50 1.7 and 52-58mm step up to go with the 18-55 kit.

Only problem I have run into, is the R-72 interfering with smaller lend hoods.

Cheers. Mike.
11-12-2009, 01:58 PM   #6
Loyal Site Supporter
Loyal Site Supporter




Join Date: Dec 2006
Location: Wherever I’m Parked
Photos: Gallery
Posts: 1,003
Original Poster
I read through several threads here for IR information (there's several very good threads with lots of information). Here's the one I found with the list of IR friendly and unfriendly lenses. https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/66895-ir-infra...ax-lenses.html .

Mike - I know what you mean about smaller lens hoods, found it out the first time I tried to put the lens hood on the DA*50-135 (67 mm) when I had a 77 mm circular polarizer on it (lens caps are a problem too - I really need to buy a generic 77 mm lens hood for the filter).

The more I think about it, the more I think it makes sense just to get the 55 and the extra step-up rings. Getting a 77 mm R72 filter is probably around half the cost of getting a camera modified and I have no idea if I'll like doing IR enough to spend that kind of money. Glad to know that step-up rings won't be a problem.
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!
filter, filters and step-up, ir, k-mount, lens, lenses, pentax lens, r72, r72 filters, rings, slr lens, step-up, step-up rings
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
filter step up rings or filters for every lens? opiet70 Pentax SLR Lens Discussion 6 12-25-2009 02:20 PM
For Sale - Sold: Filters and Step-up Rings Youngster Sold Items 3 03-02-2009 02:48 PM
For Sale - Sold: A few filters and step-up rings Youngster Sold Items 2 02-25-2009 01:26 PM
Step Down Rings for Filters... Hannican Pentax Camera and Field Accessories 3 12-25-2007 02:11 AM



All times are GMT -7. The time now is 12:45 AM. | 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