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estes53
Joined: 25 Oct 2011
Posts: 14
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 Posted: Fri Oct 28, 2011 6:57 pm Post subject: Bellows Mount |
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All these new cheap bellows from china are set up to mount at the rear, which means that the front could easily bounce.
Anybody bought one of these and mounted some type of mid bellows bracket? |
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ChrisR
Joined: 14 Mar 2009
Posts: 3051
Location: Near London, UK
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| Posted: Sat Oct 29, 2011 4:04 pm Post subject: |
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Some notes on bellows:
http://photomacrography.net/forum/viewtopic.php?t=8279
Ebay is awash with adapters , from anything to EOS.
Cneck whether you need a "Chpped" adapter. For a Rebel/550d etc, you don't, but you might for others. |
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Chris S.
Joined: 05 Apr 2009
Posts: 1088
Location: Ohio, USA
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| Posted: Sat Oct 29, 2011 4:48 pm Post subject: |
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My first bellows, purchased a long time ago, had the camera at a fixed position at the rear. I would not recommend buying such a bellows for the kind of work typical at this forum. Potential bounce could surely be corrected. But having the front of the bellows rail stick out where you want your subject to be can be a real hassle (as Rik points out in the link Chris R provided).
If the length of the bellows is short enough, and your choice of optics limited enough, that you will only use the bellows at full draw (fully extended), this might not be a problem. But if that's the case, the main benefit of a bellows--the ease of changing distance between lens and sensor--goes away. So in that limited scenario, I'd just get a T-tube (or other tube) of the appropriate length, mount adapters on front and back, clamp it in some sort of saddle, and skip the bellows altogether.
--Chris |
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estes53
Joined: 25 Oct 2011
Posts: 14
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| Posted: Sat Oct 29, 2011 7:06 pm Post subject: |
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I am either very confused, or need to supply more info about what I am doing.
I am ordering a Canon EOS Rebel T3i/600D and , so far, two lenses, a INDUSTAR-50U-1 3.5/50 and an AMAR/S 4.5/105 PZO (both enlarger lenses).
My plan was to use a bellows between them.
I have never used a fixed focus lens like this before, so understood that the bellows length would set the magnification ratio, than distance from the front element to the subject would be adjusted for focus.
If my assumptions are wrong, someone please correct me , or direct me to a tutorial of some kind, before I spend money needlessly. |
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Chris S.
Joined: 05 Apr 2009
Posts: 1088
Location: Ohio, USA
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| Posted: Sat Oct 29, 2011 7:21 pm Post subject: |
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| estes53 wrote: | | . . .understood that the bellows length would set the magnification ratio, than distance from the front element to the subject would be adjusted for focus. |
You're right. But each lens is going to have a certain range of magnifications in which it works best, and those magnifications will occur at a certain range of bellows draws. I would only recommend a bellows with a fixed rear standard under very limited circumstances--somebody wants to use a particular lens at a particular magnification, and the bellows length is well-suited to that combination. That circumstance is probably pretty uncommon, which is to say that inexpensive fixed-rear-standard bellows are probably not ideal for many people. In your situation, I would recommend buying a good bellows with movable front and rear standards, and a movable mounting point in order to get good balance for steadiness.
Sad to say, bellows like this are not the cheaper ones--at least on the new market. I suspect one might find a decent one at a good price second hand.
--Chris |
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